Perlbrew无法下载最新的tarball

Question

我已经在Ubuntu 18.04 VM上安装了perlbrew，但是我无法下载最新版本，

con@con-VirtualBox:~/20190305_concordance$ perlbrew install 5.28.1

给出错误

Fetching perl 5.28.1 as /home/con/perl5/perlbrew/dists/perl-5.28.1.tar.gz
Download http://www.cpan.org/authors/id/S/SH/SHAY/perl-5.28.1.tar.gz to /home/con/perl5/perlbrew/dists/perl-5.28.1.tar.gz
ERROR: Failed to download http://www.cpan.org/authors/id/S/SH/SHAY/perl-5.28.1.tar.gz

为什么会这样？如何获得Perlbrew安装最新版本？