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I am noob with Ubuntu and i was trying to upgrade my Ubuntu 18.04 to 18.10 with the command sudo apt dist-upgrade and everything was running smoothly, but at some point of the upgrade i saw that my terminal was shutdown by itself... I am trying to do this locally, not by ssh and now i dont know what to do... I cant restart my computer as it says

Incorrect permission on /usr/lib/policykit-1/polkid-agent-helper-1 (needs to be setuid root)

and i have two options Cancel or 'Authenticate` and when i click on authenticate nothing happens...

Also when i try to run sudo apt dist-upgrade again i got this error

E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

What i have to do now?

Dimitar
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  • Just reboot. And FYI dist-upgrade does NOT upgrade the Ubuntu version, it fully updates the current version. And that command probably should be used now (and since years ago) because it was "replaced" by full-upgrade since, I think, 16.04. –  Oct 23 '18 at 09:27
  • sudo reboot dosent work... – Dimitar Oct 23 '18 at 09:45
  • Now I can't boot my computer anymore and I am getting error... 'PKCS#7 signature not signed with a trusted key' – Dimitar Oct 23 '18 at 10:36
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    The command to bump your release (from 18.04 to 18.10) is do-release-upgrade; which modifies sources for you, and performs a 'dist-upgrade' type upgrade (BUT in a specific order to avoid problems with particularly python)... did you modify your sources & then try to dist-upgrade to the next version?? Ubuntu is not Debian (where 'dist-upgrade' performs that function). 'dist-upgrade' is just an upgrade with fewer restrictions (read the man page, dist-upgrade in addition to performing the function of upgrade, also intelligently handles changing dependencies with new versions of packages – guiverc Oct 23 '18 at 10:58
  • Does this answer your question? E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) – karel May 22 '21 at 10:44

1 Answers1

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after a few hours i manage to work it out and was able to fix the broken upgrade. First of all i was not able to reboot the system so i had to do it using the hard reboot (by pressing and holding the power button on my laptop). Then i was not able to boot the system again.

  • I had to go to the restore mode (holding Shift when system is booting) and then to go Run terminal as root (or something like that)
  • Then I had to connect to the internet and because my internet was not working i had to edit the file /etc/resolv.conf and place the following nameserver 8.8.8.8 8.8.4.4
  • Then I ran aptitude (because my apt was going me error i had to run dpkg --configure -a, but this was not helpful, so both apt and dpkg were not working for me), then i press g and then again g (twice) and aptitude start to download and upgrade all the packages that weren't upgrade because the process was stopped when the terminal shut down
  • Then i quit aptitude and run apt update and apt upgrade. Upgrade was not working again so i run dpkg --configure -a and this time dpkg worked its magic and then i run apt upgrade and if you see everything executing without any errors you are good to go and u can boot your system in a normal way and everything should work fine.

Hope i can help to all the people that were interrupted after starting the upgrading process of Ubuntu

Dimitar
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