I run into the same error over and over when I tried up upgrade to 20.04 LTS.

I'm stuck with this LXD Error, can't redo, uninstall or update my system :-/

Error Message:

==> Installing the LXD snap from the 4.0 track for ubuntu-18.04
error: requested a non-existing branch on 4.0/stable for snap "lxd":
dpkg: Fehler beim Bearbeiten des Archivs /var/cache/apt/archives/lxd_1%3a0.9_all.deb (--unpack):
 new lxd package pre-installation script subprocess returned error exit status 1
Fehler traten auf beim Bearbeiten von:
E: Sub-process /usr/bin/dpkg returned an error code (1)


  • Please provide more information. What error you get when you try to uninstall lxd ?
    – KK Patel
    Oct 6, 2020 at 11:23
  • Hello, it's running in a error asking for trying "apt --fix-broken install" and that lead's to the same error as above
    – canterro
    Oct 6, 2020 at 11:30

1 Answer 1


Try the below and see if that works.

sudo apt purge lxd lxd-client
sudo do-release upgrade
  • 1
    Great, thank you that did help me to get rid of that LXD error :-)
    – canterro
    Oct 6, 2020 at 12:01
  • No worries, if you could please mark above post as the solution, it would be appreciated :) Oct 6, 2020 at 12:13
  • 4
    @quadcoretoaster I think the correct command should be "do-release-upgrade".
    – icasimpan
    Nov 9, 2020 at 21:56

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