Please note that you shouldn't uncomment any lines in sisyphus.*.list
files without understanding the following matters:

* Sisyphus is ALT Linux unstable branch, it's not suitable for
  production systems even if being nice development environment;

* Sisyphus does not and cannot provide dedicated "security updates"
  repository since it is a moving target incorporating both security
  fixes and major code revamps;

* breakage also happens from time to time in Sisyphus, it's hard to tell
  without following sisyphus@ mailing list or at least inspecting the
  announce page: http://wiki.sisyphus.ru/changes [ru]

In any case, never ever mix up any stable repo being uncommented in
apt sources and Sisyphus being uncommented too: this is a very dangerous
mixture which has been proven more than once by experienced but careless
folks.  If in doubt, subscribe and ask in one of these mailing lists:

https://lists.altlinux.org/mailman/listinfo/community-en/ [en]
https://lists.altlinux.org/mailman/listinfo/sisyphus/ [ru; en OK]

Backports are less QA covered than Sisyphus as of spring 2007 but
still based on a stable branch; you should be somewhat careful though
and in case of any doubt ask in appropriate mailing list:

https://lists.altlinux.org/mailman/listinfo/backports/ [ru; en OK]

We hope that you will enjoy using ALT Linux.

-- 
ALT Linux Team