Ubuntu之非NON-LTS(Long Term Support)版本，通常9個月後就不再support，所以apt-get update更新往往就會看到找不到package的錯誤。 此時這些舊的package都會被移到http://old-releases.ubuntu.com/，所以要改一下路徑apt package的路徑。
brook@vista:~$ cat /etc/issue Ubuntu 13.04 \n \l brook@vista:~$ sudo apt-get update [sudo] password for brook: Ign http://extras.ubuntu.com raring Release.gpg Ign http://archive.ubuntu.com raring Release.gpg .... W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/main/binary-i386/Packages 404 Not Found [IP: 91.189.88.149 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.88.149 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/universe/binary-i386/Packages 404 Not Found [IP: 91.189.88.149 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.88.149 80] E: Some index files failed to download. They have been ignored, or old ones used instead.
Solution：
brook@vista:~$ cat /etc/apt/sources.list #deb http://old-releases.ubuntu.com/ raring-security main #deb http://old-releases.ubuntu.com/ubuntu/dists/raring-security/restricted/ raring-security main deb http://old-releases.ubuntu.com/ubuntu/ raring main deb http://old-releases.ubuntu.com/ubuntu/ raring universe
apt-get可以搭配-o Debug::進行debug, 比如,
回覆刪除sudo apt-get update -o Debug::Acquire::http=1
其餘的Debug option可以參考man apt.conf
----- Hash Sum mismatch issue -----
回覆刪除http://www.webhek.com/post/linux-apt-get-update-hash-sum-mismatch-error.html
root@vista:~# apt-get update
Fetched 8480 kB in 1s (5928 kB/s)
AppStream cache update completed, but some metadata was ignored due to errors.
Reading package lists... Done
E: Failed to fetch store:/var/lib/apt/lists/partial/tw.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Com
ponents-amd64.yml Hash Sum mismatch
E: Failed to fetch http://tw.archive.ubuntu.com/ubuntu/dists/xenial-updates/multiverse/dep11/icons-64x64.tar
E: Some index files failed to download. They have been ignored, or old ones used instead.
root@vista:~# apt-get clean
root@vista:~# rm -rf /var/lib/apt/lists/*
root@vista:~# apt-get clean
root@vista:~# apt-get update