My Linux Mint 20 installation suddenly stopped updating. Update Manger says "Your APT configuration is corrupt". Running apt update produces the following messages:
Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:2 http://ppa.launchpad.net/kdenlive/kdenlive-stable/ubuntu focal InRelease [18,1 kB]
Get:3 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Err:2 http://ppa.launchpad.net/kdenlive/kdenlive-stable/ubuntu focal InRelease
At least one invalid signature was encountered.
Err:1 http://security.ubuntu.com/ubuntu focal-security InRelease
At least one invalid signature was encountered.
Err:3 http://archive.ubuntu.com/ubuntu focal InRelease
At least one invalid signature was encountered.
Get:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Err:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
At least one invalid signature was encountered.
Get:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Err:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease
At least one invalid signature was encountered.
Ign:6 http://packages.linuxmint.com ulyana InRelease
Get:7 http://packages.linuxmint.com ulyana Release [24,1 kB]
Get:8 http://packages.linuxmint.com ulyana Release.gpg [833 B]
Ign:8 http://packages.linuxmint.com ulyana Release.gpg
Get:9 http://archive.canonical.com/ubuntu focal InRelease [12,1 kB]
Err:9 http://archive.canonical.com/ubuntu focal InRelease
At least one invalid signature was encountered.
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net/kdenlive/kdenlive-stable/ubuntu focal InRelease: At least one invalid signature was encountered.
E: The repository 'http://ppa.launchpad.net/kdenlive/kdenlive-stable/ubuntu focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://security.ubuntu.com/ubuntu focal-security InRelease: At least one invalid signature was encountered.
E: The repository 'http://security.ubuntu.com/ubuntu focal-security InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.ubuntu.com/ubuntu focal InRelease: At least one invalid signature was encountered.
E: The repository 'http://archive.ubuntu.com/ubuntu focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.ubuntu.com/ubuntu focal-updates InRelease: At least one invalid signature was encountered.
E: The repository 'http://archive.ubuntu.com/ubuntu focal-updates InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.ubuntu.com/ubuntu focal-backports InRelease: At least one invalid signature was encountered.
E: The repository 'http://archive.ubuntu.com/ubuntu focal-backports InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://packages.linuxmint.com ulyana Release: At least one invalid signature was encountered.
E: The repository 'http://packages.linuxmint.com ulyana Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.canonical.com/ubuntu focal InRelease: At least one invalid signature was encountered.
E: The repository 'http://archive.canonical.com/ubuntu focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
I tried running apt clean, but this did not resolve the issue.
Also, apt-key list gives the following strange message:
base64: invalid input
Please help.
Best Answer
Found solution for my case!
apt-get update
wrote that in many repos "At least one invalid signature was encountered." There were no messages about missed GPG keys. Exactly like your output, but other repos.I run
apt-key list
and somewhere in between i noticedbase64: invalid input
message.This was somewhere in the middle of my output
I found that it means that there is bad key file in a folder
/apt/trusted.gpg.d/
betweennordvpn-keyring.gpg
andsteam.gpg
(alphabetical order of files). In my case there were two strange files with not .gpg extension. These files were newer than others. This was another clue about their involvement.I deleted them and suddenly everything started to work!
It seems that all key files that was listed after those two was not worked.
// Linux Mint 19