Public bug reported:
When adding a PPA using the "sudo add-apt-repository ppa:ppa-name"
command, the distribution codename specified in /etc/lsb-release is used
when adding the entry to /etc/apt/sources.list. Unfortunately, this
has the side effect of causing the add PPA functionality to not work
properly on downstream distros who ship with their own codename -- the
user must manually change the incorrect distribution entry to the
relevant Ubuntu one and refresh the package repos before using the PPA.
Downstream distros wishing to use their own repos alongside the Ubuntu
ones must provide a unique distribution codename in their mirrors file
in /usr/share/python-apt/templates, otherwise software-properties-gtk
thinks the downstream distro's repository is a mirror of the Ubuntu one,
and forces the user choose between them.
A better solution that would solve both needs would be add a check to
the add PPA process:
When adding a PPA, check the current distribution codename against a set
of known official Ubuntu codenames. If they match, continue as before.
If they do not match, default to using the Ubuntu codename current for
the installed version of software-properties package.
** Affects: software-properties (Ubuntu)
Importance: Undecided
Status: New
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Adding ppa does not work properly on downstream distros based on Ubuntu
https://bugs.launchpad.net/bugs/635427
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