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с етим разобрался но почему я не могу установить пакеты ввожу

apt-get install perl libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl apt-show-versions python

оно в ответ

Reading package lists... Done
Building dependency tree... Done
Package libnet-ssleay-perl 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

Package libauthen-pam-perl 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

Package libio-pty-perl 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

Package apt-show-versions 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

E: Package 'libnet-ssleay-perl' has no installation candidate
E: Package 'libauthen-pam-perl' has no installation candidate
E: Package 'libio-pty-perl' has no installation candidate
E: Package 'apt-show-versions' has no installation candidate

что делать?