问题现象
# apt update
Get:1 http://archive.ubuntu.com/ubuntu noble InRelease [256 kB]
Get:2 http://security.ubuntu.com/ubuntu noble-security InRelease [126 kB]
Err:2 http://security.ubuntu.com/ubuntu noble-security InRelease At least one invalid signature was encountered.
Err:1 http://archive.ubuntu.com/ubuntu noble InReleaseAt least one invalid signature was encountered.
Get:3 http://archive.ubuntu.com/ubuntu noble-updates InRelease [126 kB]
Err:3 http://archive.ubuntu.com/ubuntu noble-updates InReleaseAt least one invalid signature was encountered.
Get:4 http://archive.ubuntu.com/ubuntu noble-backports InRelease [126 kB]
Err:4 http://archive.ubuntu.com/ubuntu noble-backports InReleaseAt least one invalid signature was encountered.
Reading package lists... Done
W: GPG error: http://security.ubuntu.com/ubuntu noble-security InRelease: At least one invalid signature was encountered.
E: The repository 'http://security.ubuntu.com/ubuntu noble-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 noble InRelease: At least one invalid signature was encountered.
E: The repository 'http://archive.ubuntu.com/ubuntu noble 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 noble-updates InRelease: At least one invalid signature was encountered.
E: The repository 'http://archive.ubuntu.com/ubuntu noble-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 noble-backports InRelease: At least one invalid signature was encountered.
E: The repository 'http://archive.ubuntu.com/ubuntu noble-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.解决办法
原因很大可能是历史apt下载的太多了清除一下缓存即可
# docker system df // which can show disk usage and size of 'Build Cache'
# docker image prune // add -f or --force to not prompt for confirmation
# docker container prune // add -f or --force to not prompt for confirmation