$ sudo cpan
cpan[1]> upgrade
$ cpan Dancer
Reading ‘/home/vagrant/.cpan/sources/authors/01mailrc.txt.gz’
………………………………………………………………….DONE
Reading ‘/home/vagrant/.cpan/sources/modules/02packages.details.txt.gz’
Database was generated on Tue, 11 Sep 2018 09:17:02 GMT
HTTP::Date not available
………….
New CPAN.pm version (v2.16) available.
[Currently running version is v2.00]
You might want to try
install CPAN
reload cpan
to both upgrade CPAN.pm and run the new version without leaving
the current session.
…………………………………………….Killed
あああああああああ、もうubuntuではできん。。centosでやろう。