Your problem is probably better handled by the PPA author, as commented by @N0orbert. I offer an alternate option here.
Another possibility is to install a "portable" TeXLive instance in a directory under your home (I have several TeXLive instances installed in my system; I use them to check my package under several version of the main packages --- TeX/LaTeX is a very active community, and 3 years of development is a lot of changes). The advantage is that your installation is in parallel to the system one, the disadvantage is that it is not easily integrated in the desktop (you have to use a lot of command line instruction [note 1]).
Do everything as a normal user, so you will not touch the standard installation.
Basically you follow the instructions to acquire a network TeXLive installation.
- download the TeXLive network installer
- follow the instruction to install the network version of TeXLive https://tug.org/texlive/acquire-netinstall.html --- be sure to select a "portable installation" under a personal directory, like
$HOME/texlive2020
or similar.
- You now have to change your PATH to find the new directories before the system ones. I use this script from AlexG to have a shell using the portable one.
Notice that this is a sort-of advanced setup, so you need to understand things as the environment variables, startup scripts, PATH
and similar thing, otherwise do not do it.
The downside is that you will need an extra 6-8 Gbyte for every TeXLive version you have (more if you do not disable backups[note 2]) and all of this will need to be downloaded from your internet link.
[note 1] Well, you can change your startup scripts to add the new directories in front of the standard ones. It will be only for your user and I never did it, so I do not guarantee that it will work ok.
[note 2] You have to keep your new repository up-to-date, running tlmgr update --all --self
(with the correct PATH
!) manually from time to time. That will keep old package versions as backups; you can remove them/avoid them if you want, but by default it will do backups.