download CPAN module from this page http://metacpan.org/pod/CPAN
untar it (
tar zxf CPAN-2.00.tar.gz
), cd into the directory and runperl Makefile.PL make test sudo make install
edit: if it breaks making a path with :: in it then perhaps your filesystem type does not support these characters in a filename
To see the filesystem type, run mount
without any parameters and all the mounted filesystems with their types will be shown
The error Can't write-open blib/man3/CPAN::Admin.3pm
seems to suggest a filesystem problem, but ext4 in rw mode sounds alright. Try this from the CPAN-2.00
directory
perl -e 'open($f,">blib/man3/CPAN::thisisatest") || die $!;'