报错：
Missing Signed-By in the sources.list
https://www.cnblogs.com/bwcgq/p/18554260
https://www.digitalocean.com/community/questions/n-missing-signed-by-in-the-sources-list-5-entry-for-http-mirrors-digitalocean-com-ubuntu
https://askubuntu.com/questions/1516700/missing-signed-by-in-the-sources-list5-entry-after-installing-ubuntu-24-04