собственно сабж -
sudo layman -a stuff
Password:
* Adding overlay,...
* Running Git... # /usr/bin/git clone https://github.com/megabaks/stuff.git /var/lib/layman/stuff
Cloning into '/var/lib/layman/stuff'...
error: Peer certificate cannot be authenticated with given CA certificates while accessing https://github.com/megabaks/stuff.git/info/refs
fatal: HTTP request failed
* Failure result returned from Git
* Adding repository "stuff" failed!
* CLI: Errors occured processing action add
* Adding repository "stuff" failed!