I cannot update the installed software, and also the Debian repositories are not available:
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$ sudo apt-get install ssh
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package ssh is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
openssh-client
E: Package 'ssh' has no installation candidate
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Release file expired, ignoring http://security.debian.org/dists/squeeze/updates/Release (invalid since 7d 2h 26min 8s)
Here sources.list:
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deb http://packages.linuxmint.com/ debian main upstream import
deb http://ftp.de.debian.org/debian/ squeeze main contrib non-free
deb http://security.debian.org/ squeeze/updates main contrib non-free
deb http://www.debian-multimedia.org/ squeeze main non-free
Thanks a bunch.