You Don't want to uninstall Perl 5.10.x that ships with Ubuntu. That's the system Perl. Don't touch it. If you want to run another version of Perl download it and install it to another path:

./Configure -des -Dprefix=$HOME/Your/other/path/here
make test
make install
[download]

Update: Different major versions or Perl aren't binary compatible, (e.g. 5.8.x to 5.10.x), you can't expect modules with aren't pure Perl to work without reinstalling said modules.