1
rinka@rinka-pc:~$ sudo apt-get update
[sudo] password for rinka: 
Get:1 https://repo.steampowered.com/steam stable InRelease [2,852 B]
Err:1 https://repo.steampowered.com/steam stable InRelease                     
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F24AEA9FB05498B7
Hit:2 http://archive.canonical.com/ubuntu focal InRelease                      
Get:3 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu focal InRelease [17.5 kB]
Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease               
Hit:5 http://ph.archive.ubuntu.com/ubuntu focal InRelease                      
Err:3 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu focal InRelease     
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 531EE72F4C9D234C
Hit:6 https://repo.protonvpn.com/debian stable InRelease
Hit:7 http://ph.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:8 http://ph.archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists... Done
W: GPG error: https://repo.steampowered.com/steam stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F24AEA9FB05498B7
E: The repository 'https://repo.steampowered.com/steam stable 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://ppa.launchpad.net/nilarimogard/webupd8/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 531EE72F4C9D234C
E: The repository 'http://ppa.launchpad.net/nilarimogard/webupd8/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.
rinka@rinka-pc:~$
Rinka Sei
  • 21

3 Answers3

2

from steam repo docs:

Download steam.gpg and copy it to /usr/share/keyrings/steam.gpg, example:

sudo mv -v ~/Downloads/steam.gpg /usr/share/keyrings/steam.gpg
felipsmartins
  • 123
  • 7
0

You have to re-add expired GPG keys. Open terminal and type:

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys F24AEA9FB05498B7 531EE72F4C9D234C

and then update package lists with

sudo apt-get update
N0rbert
  • 99,918
0

Since I can't edit answers yet, I'm just making a new answer.

As N0rbert said, expired GPG keys have to be re-added. This can be done by executing:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F24AEA9FB05498B7 531EE72F4C9D234C

This should normally fix the problem. However, there is another problem, because this will add Steam's GPG key to /etc/apt/trusted.gpg, even though Steam's sources file (/etc/apt/sources.list.d/steam-stable.list) specifies to look for /usr/share/keyrings/steam.gpgsource. This can be fixed by executing:

sudo apt-key export B05498B7 | sudo gpg --dearmour -o /usr/share/keyrings/steam.gpg

I was having the same problem, and this seemed to fix it.

malijaffri
  • 1