Can't add PPA on Ubuntu 15.10 - user or team does not exist
75879
How do I get add-apt-repository to work through a proxy?
1833
14.04 Cleanly upgrade to ppa:ondrej/php from ppa:ondrej/php5-5.6
48418
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:
83503
How to add existing user to an existing group?
150182
Ubuntu 14.04: problems upgrading php to 5.6 using ppa:ondrej
36772
Is it possible to only allow specific packages updates from a PPA
115722
Apt sources.list problem , packages not found?
107786
PPA error while installing Albert application launcher in Ubuntu 18.04
118516
Add AD users to sudo group not working | CentOS 6.7
105208
How can I check if a PPA has packages for another Ubuntu version?
32925
What steps to add a user to a system without using useradd/adduser?
106800
How can I contribute to Ubuntu?
47843
Upgraded to Chrome 61.0.3163 via ppa on Ubuntu 16.04 but it won't launch because NSS out of date
79163
Sources missing in /etc/apt/sources.list, how do I get them back?
119294
Package dependency on two PPA
28247
Google Chrome PPA upgrade invalid signature
109277
Can't Add ppa:x2go/stable