Can't update for a week

[sanaag]

Hello everybody,
Any help what to do with the error below? The suggested solutions online, namely add PUBKEY and remove speedtest, didn't work. Thanks!


============ Log ===========

Hit:1 https://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://ppa.launchpad.net/audio-recorder/ppa/ubuntu focal InRelease
Hit:3 http://archive.canonical.com/ubuntu focal InRelease
Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:6 http://repo.linuxliteos.com/linuxlite emerald InRelease
Get:7 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:8 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Get:9 https://packagecloud.io/ookla/speedtest-cli/ubuntu focal InRelease [24,5 kB]
Err:9 https://packagecloud.io/ookla/speedtest-cli/ubuntu focal InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E61C2AB9A6D1557
Reading package lists...
W: GPG error: https://packagecloud.io/ookla/speedtest-cli/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E61C2AB9A6D1557
E: The repository 'https://packagecloud.io/ookla/speedtest-cli/ubuntu focal InRelease' is not signed.