Seems the GPG keys have just expired? Have tried updating them from latest on the website but not working
Err:5 https://packages.gitlab.com/gitlab/gitlab-ce/ubuntu focal InRelease
The following signatures were invalid: EXPKEYSIG 3F01618A51312F3F GitLab B.V. (package repository signing key) <packages@gitlab.com>
Get:6 https://packages.gitlab.com/gitlab/gitlab-ee/ubuntu focal InRelease [23.4 kB]
Err:6 https://packages.gitlab.com/gitlab/gitlab-ee/ubuntu focal InRelease
The following signatures were invalid: EXPKEYSIG 3F01618A51312F3F GitLab B.V. (package repository signing key) <packages@gitlab.com>
Reading package lists... Done