in reply to Installing Term::ReadLine::Gnu

Ubuntu provides prebuilt apt packages for most CPAN libraries 
:~$ apt-cache search Term::ReadLine::Gnu
libterm-readline-gnu-perl - Perl extension for the GNU Readline/Histor
+y Library

[download]
So all you have to do is 
:~$ sudo apt-get install libterm-readline-gnu-perl

[download]
Hope that helps
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In Section Seekers of Perl Wisdom