$ apt-get source zsh
Reading Package Lists... Done
Building Dependency Tree... Done
Need to get 1916kB of source archives.
Get:1 ftp://ftp.altlinux.com i586/classic zsh 1:4.0.6-alt1 (srpm) [1916kB]
Err ftp://ftp.altlinux.com i586/classic zsh 1:4.0.6-alt1 (srpm)
  Unable to fetch file, server said 'Failed to open file.  '
Failed to fetch
ftp://ftp.altlinux.com/pub/distributions/ALTLinux/Sisyphus/i586/../../SRPMS.classic/zsh-4.0.6-alt1.src.rpm
----------------------------------------------------------------^^^^^
Кажется, лишний уровнь наверх.

Unable to fetch file, server said 'Failed to open file.  '
E: Failed to fetch some archives.
$ wget


-- 
WBR, Alexey Tourbin
BIOZAK Ltd., Russia