i try sudo add-apt-repository ppa:x2go/stable or sudo -E add-apt-repository ppa:x2go/stable

and have the same result: Cannot add PPA: 'ppa:~x2go/ubuntu/stable' ERROR: '~x2go' user or team does not exist

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    ps: I have already config proxy for apt, and still stuck with this. I need new answers (not config proxy or add '-E' , because it not work for me) Thanks :)). sorry for my bad english – Nghi Thanh Feb 1 at 8:40

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