Docker容器中的ubuntu apt update报错 解决办法

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 InRelease
  At 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 InRelease
  At 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 InRelease
  At 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