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How do I reattach to Ubuntu Server's 'do-release-upgrade' process?

Ubuntu Server upgrade over SSH hangUbuntu - upgrade distribution to specific releaseUbuntu: setting timeout value on do-release-upgrade?Ubuntu: remotely disable upgrade?do-release-upgrade -d Ubuntu 13.10 -> 14.04 failingDpkg: After comparing config files, how do I revert back to make my choice?do-release-upgrade skipped a version - how to specify a release?EC2 Ubuntu 12.04 refuses do-release-upgradeSo how do I force upgrade from Ubuntu LTS to the next LTS without waiting for the point release?about do-release-upgrade on ubuntu server ltsUbuntu 14.04 (on linode) not doing “do-release-upgrade”

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76

22

I accidentally pressed Ctrl+C during Ubuntu Server's do-release-upgrade process. I'd dropped to a shell to compare a .conf file in /etc/. When I pressed Ctrl-C, it asked whether I wanted to try to reattach to the upgrade process, but it failed to do so.

So I quit, and now there's a hanging dpkg process which is holding onto the apt lock. This is a virtualised server with no GUI frontend...

Is it possible to recover the upgrade process, or do I have to kill the dpkg process and start again?

ubuntu upgrade

share|improve this question

edited Oct 14 '16 at 16:21

JonTheNiceGuy

77357

asked May 9 '12 at 17:18

Alex LeachAlex Leach

7021813

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Does screen -list still list the upgrade process? If so, screen -r might reattach it again. What was the exact error when trying to reattach?
  
  – arjarj
  May 9 '12 at 18:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I later tried screen -RD, but it didn't work. There wasn't any screen daemon running, so there was nothing to re-connect to. Exact error? I had a choice of 'r' or 'q' I think (reconnect or quit) at the bottom of a curses-like app. Sorry, I can't be more helpful than that. I was using VirtualBox, and without a tmux or screen session running I had no scrollback and the curses-like interface kept clearing the screen. Reconnect didn't work, so I just quit.
  
  – Alex Leach
  May 9 '12 at 20:46
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I should add that I did try screen -R -D as both sudo user and my normal user..
  
  – Alex Leach
  May 9 '12 at 20:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  possible duplicate of Ubuntu Server upgrade over SSH hang
  
  – Michael Hampton♦
  Sep 13 '12 at 9:52
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Yes! dpkg configure -a is the right answer. That happened to me and the really bad thing was that bind9 was not correctly setup (i.e. the Ctrl-C must have stopped that process and it couldn't start anymore!) Once I fixed bind9 then the apt-get update + upgrade + dist-upgrade ran like a charm and after that I rebooted and it all worked.
  
  – Alexis Wilke
  Oct 7 '12 at 16:34
  
  

  
  
  
  

add a comment | 

76

22

I accidentally pressed Ctrl+C during Ubuntu Server's do-release-upgrade process. I'd dropped to a shell to compare a .conf file in /etc/. When I pressed Ctrl-C, it asked whether I wanted to try to reattach to the upgrade process, but it failed to do so.

So I quit, and now there's a hanging dpkg process which is holding onto the apt lock. This is a virtualised server with no GUI frontend...

Is it possible to recover the upgrade process, or do I have to kill the dpkg process and start again?

ubuntu upgrade

share|improve this question

edited Oct 14 '16 at 16:21

JonTheNiceGuy

77357

asked May 9 '12 at 17:18

Alex LeachAlex Leach

7021813

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Does screen -list still list the upgrade process? If so, screen -r might reattach it again. What was the exact error when trying to reattach?
  
  – arjarj
  May 9 '12 at 18:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I later tried screen -RD, but it didn't work. There wasn't any screen daemon running, so there was nothing to re-connect to. Exact error? I had a choice of 'r' or 'q' I think (reconnect or quit) at the bottom of a curses-like app. Sorry, I can't be more helpful than that. I was using VirtualBox, and without a tmux or screen session running I had no scrollback and the curses-like interface kept clearing the screen. Reconnect didn't work, so I just quit.
  
  – Alex Leach
  May 9 '12 at 20:46
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I should add that I did try screen -R -D as both sudo user and my normal user..
  
  – Alex Leach
  May 9 '12 at 20:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  possible duplicate of Ubuntu Server upgrade over SSH hang
  
  – Michael Hampton♦
  Sep 13 '12 at 9:52
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Yes! dpkg configure -a is the right answer. That happened to me and the really bad thing was that bind9 was not correctly setup (i.e. the Ctrl-C must have stopped that process and it couldn't start anymore!) Once I fixed bind9 then the apt-get update + upgrade + dist-upgrade ran like a charm and after that I rebooted and it all worked.
  
  – Alexis Wilke
  Oct 7 '12 at 16:34
  
  

  
  
  
  

add a comment | 

I accidentally pressed Ctrl+C during Ubuntu Server's do-release-upgrade process. I'd dropped to a shell to compare a .conf file in /etc/. When I pressed Ctrl-C, it asked whether I wanted to try to reattach to the upgrade process, but it failed to do so.

So I quit, and now there's a hanging dpkg process which is holding onto the apt lock. This is a virtualised server with no GUI frontend...

Is it possible to recover the upgrade process, or do I have to kill the dpkg process and start again?

ubuntu upgrade

share|improve this question

edited Oct 14 '16 at 16:21

JonTheNiceGuy

77357

asked May 9 '12 at 17:18

Alex LeachAlex Leach

7021813

share|improve this question

edited Oct 14 '16 at 16:21

JonTheNiceGuy

77357

asked May 9 '12 at 17:18

Alex LeachAlex Leach

7021813

share|improve this question

edited Oct 14 '16 at 16:21

JonTheNiceGuy

77357

asked May 9 '12 at 17:18

Alex LeachAlex Leach

7021813

edited Oct 14 '16 at 16:21

JonTheNiceGuy

77357

edited Oct 14 '16 at 16:21

JonTheNiceGuy

77357

asked May 9 '12 at 17:18

Alex LeachAlex Leach

7021813

asked May 9 '12 at 17:18

Alex LeachAlex Leach

7021813

3 Answers
3

active

oldest

votes

111

+50

I usually do release upgrades over VPN, so I've tried this a few times. Whenever it updates my openvpn package I lose connection, so I reconnect afterwards.

do-release-upgrade starts a backup SSH session on port 1022 and a backup screen session. If you do not have screen installed this will NOT be available.

You can get the screen session by running:

sudo screen -list
There is a screen on:
 2953.ubuntu-release-upgrade-screen-window (09/13/2012 04:48:02 AM) (Detached)
1 Socket in /var/run/screen/S-root.

Then to reattach do:

sudo screen -d -r root/2953.ubuntu-release-upgrade-screen-window

Using the previously listed screen after root/

You should be back to where you lost connection.

share|improve this answer

edited May 6 at 8:45

answered Sep 13 '12 at 9:17

Alex RAlex R

1,41321214

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I dont have screen installed... and i cannot install one with apt-get (file locked)
  
  – inemanja
  Apr 27 at 17:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This is extremely helpful. It might be an even better answer if you just added short mention that do-release-upgrade indeed automatically starts a screen session (you had me reread the question for a second to look for any mention of having started the upgrade process via screen)
  
  – polynomial_donut
  May 3 at 6:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm amazed this question keeps getting +1s it's so old
  
  – Alex R
  May 6 at 8:39
  

  
  
  
  

add a comment | 

27

I had the same issue while upgrading to quantal. Unfortunately for me, like the original poster, the screen was killed as well because of ctrl+c.

Killing the dpkg and restarting it with "--configure -a" solved the problem.

Thanks

share|improve this answer

answered Dec 3 '12 at 0:05

Arul SelvanArul Selvan

1,1101111

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you thank you thank you. This worked for me.
  
  – firebush
  Apr 23 '18 at 19:45
  

  
  
  
  

add a comment | 

1

I'm more of a CentOS / RHEL person myself but in my experience you're pretty much always better of killing and starting the process over. The downloads, syncs, etc should already be complete and not need to be redone. Since that is what takes the majority of time there shouldn't be much lost going this route.

share|improve this answer

answered May 9 '12 at 17:43

Tim BrighamTim Brigham

13.5k75098

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yea, there's not much else that can be done I think. I could probably have used reptyr to reattach to the pty/tty (I never know the difference), but it's easier starting from scratch. And you're right; it's much quicker the second time round!
  
  – Alex Leach
  May 9 '12 at 17:48
  

  
  
  
  

add a comment | 

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111

+50

I usually do release upgrades over VPN, so I've tried this a few times. Whenever it updates my openvpn package I lose connection, so I reconnect afterwards.

do-release-upgrade starts a backup SSH session on port 1022 and a backup screen session. If you do not have screen installed this will NOT be available.

You can get the screen session by running:

sudo screen -list
There is a screen on:
 2953.ubuntu-release-upgrade-screen-window (09/13/2012 04:48:02 AM) (Detached)
1 Socket in /var/run/screen/S-root.

Then to reattach do:

sudo screen -d -r root/2953.ubuntu-release-upgrade-screen-window

Using the previously listed screen after root/

You should be back to where you lost connection.

share|improve this answer

edited May 6 at 8:45

answered Sep 13 '12 at 9:17

Alex RAlex R

1,41321214

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I dont have screen installed... and i cannot install one with apt-get (file locked)
  
  – inemanja
  Apr 27 at 17:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This is extremely helpful. It might be an even better answer if you just added short mention that do-release-upgrade indeed automatically starts a screen session (you had me reread the question for a second to look for any mention of having started the upgrade process via screen)
  
  – polynomial_donut
  May 3 at 6:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm amazed this question keeps getting +1s it's so old
  
  – Alex R
  May 6 at 8:39
  

  
  
  
  

add a comment | 

111

+50

I usually do release upgrades over VPN, so I've tried this a few times. Whenever it updates my openvpn package I lose connection, so I reconnect afterwards.

do-release-upgrade starts a backup SSH session on port 1022 and a backup screen session. If you do not have screen installed this will NOT be available.

You can get the screen session by running:

sudo screen -list
There is a screen on:
 2953.ubuntu-release-upgrade-screen-window (09/13/2012 04:48:02 AM) (Detached)
1 Socket in /var/run/screen/S-root.

Then to reattach do:

sudo screen -d -r root/2953.ubuntu-release-upgrade-screen-window

Using the previously listed screen after root/

You should be back to where you lost connection.

share|improve this answer

edited May 6 at 8:45

answered Sep 13 '12 at 9:17

Alex RAlex R

1,41321214

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I dont have screen installed... and i cannot install one with apt-get (file locked)
  
  – inemanja
  Apr 27 at 17:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This is extremely helpful. It might be an even better answer if you just added short mention that do-release-upgrade indeed automatically starts a screen session (you had me reread the question for a second to look for any mention of having started the upgrade process via screen)
  
  – polynomial_donut
  May 3 at 6:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm amazed this question keeps getting +1s it's so old
  
  – Alex R
  May 6 at 8:39
  

  
  
  
  

add a comment | 

I usually do release upgrades over VPN, so I've tried this a few times. Whenever it updates my openvpn package I lose connection, so I reconnect afterwards.

do-release-upgrade starts a backup SSH session on port 1022 and a backup screen session. If you do not have screen installed this will NOT be available.

You can get the screen session by running:

sudo screen -list
There is a screen on:
 2953.ubuntu-release-upgrade-screen-window (09/13/2012 04:48:02 AM) (Detached)
1 Socket in /var/run/screen/S-root.

Then to reattach do:

sudo screen -d -r root/2953.ubuntu-release-upgrade-screen-window

Using the previously listed screen after root/

You should be back to where you lost connection.

share|improve this answer

edited May 6 at 8:45

answered Sep 13 '12 at 9:17

Alex RAlex R

1,41321214

sudo screen -list
There is a screen on:
 2953.ubuntu-release-upgrade-screen-window (09/13/2012 04:48:02 AM) (Detached)
1 Socket in /var/run/screen/S-root.

sudo screen -d -r root/2953.ubuntu-release-upgrade-screen-window

share|improve this answer

edited May 6 at 8:45

answered Sep 13 '12 at 9:17

Alex RAlex R

1,41321214

answered Sep 13 '12 at 9:17

Alex RAlex R

1,41321214

answered Sep 13 '12 at 9:17

Alex RAlex R

1,41321214

27

I had the same issue while upgrading to quantal. Unfortunately for me, like the original poster, the screen was killed as well because of ctrl+c.

Killing the dpkg and restarting it with "--configure -a" solved the problem.

Thanks

share|improve this answer

answered Dec 3 '12 at 0:05

Arul SelvanArul Selvan

1,1101111

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you thank you thank you. This worked for me.
  
  – firebush
  Apr 23 '18 at 19:45
  

  
  
  
  

add a comment | 

27

I had the same issue while upgrading to quantal. Unfortunately for me, like the original poster, the screen was killed as well because of ctrl+c.

Killing the dpkg and restarting it with "--configure -a" solved the problem.

Thanks

share|improve this answer

answered Dec 3 '12 at 0:05

Arul SelvanArul Selvan

1,1101111

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you thank you thank you. This worked for me.
  
  – firebush
  Apr 23 '18 at 19:45
  

  
  
  
  

add a comment | 

I had the same issue while upgrading to quantal. Unfortunately for me, like the original poster, the screen was killed as well because of ctrl+c.

Killing the dpkg and restarting it with "--configure -a" solved the problem.

Thanks

share|improve this answer

answered Dec 3 '12 at 0:05

Arul SelvanArul Selvan

1,1101111

share|improve this answer

answered Dec 3 '12 at 0:05

Arul SelvanArul Selvan

1,1101111

answered Dec 3 '12 at 0:05

Arul SelvanArul Selvan

1,1101111

answered Dec 3 '12 at 0:05

Arul SelvanArul Selvan

1,1101111

1

I'm more of a CentOS / RHEL person myself but in my experience you're pretty much always better of killing and starting the process over. The downloads, syncs, etc should already be complete and not need to be redone. Since that is what takes the majority of time there shouldn't be much lost going this route.

share|improve this answer

answered May 9 '12 at 17:43

Tim BrighamTim Brigham

13.5k75098

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yea, there's not much else that can be done I think. I could probably have used reptyr to reattach to the pty/tty (I never know the difference), but it's easier starting from scratch. And you're right; it's much quicker the second time round!
  
  – Alex Leach
  May 9 '12 at 17:48
  

  
  
  
  

add a comment | 

1

I'm more of a CentOS / RHEL person myself but in my experience you're pretty much always better of killing and starting the process over. The downloads, syncs, etc should already be complete and not need to be redone. Since that is what takes the majority of time there shouldn't be much lost going this route.

share|improve this answer

answered May 9 '12 at 17:43

Tim BrighamTim Brigham

13.5k75098

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yea, there's not much else that can be done I think. I could probably have used reptyr to reattach to the pty/tty (I never know the difference), but it's easier starting from scratch. And you're right; it's much quicker the second time round!
  
  – Alex Leach
  May 9 '12 at 17:48
  

  
  
  
  

add a comment | 

I'm more of a CentOS / RHEL person myself but in my experience you're pretty much always better of killing and starting the process over. The downloads, syncs, etc should already be complete and not need to be redone. Since that is what takes the majority of time there shouldn't be much lost going this route.

share|improve this answer

answered May 9 '12 at 17:43

Tim BrighamTim Brigham

13.5k75098

share|improve this answer

answered May 9 '12 at 17:43

Tim BrighamTim Brigham

13.5k75098

answered May 9 '12 at 17:43

Tim BrighamTim Brigham

13.5k75098

answered May 9 '12 at 17:43

Tim BrighamTim Brigham

13.5k75098