`bootstrap.sh` overrides environment variable of the pre-installed gamemode on Ubuntu 20.04 LTS

[jqadev]

Describe the bug I use Ubuntu 20.04 LTS with the pre-installed gamemode v1.5.1 listed here. Installation of the gamemode v1.6-dev overrides environment variable of the pre-installed version.

To Reproduce Steps used to reproduce the behavior:

1. Install and uninstall gamemode v1.6-dev using the instruction available here on Ubuntu 20.04 LTS with the pre-installed gamemode v1.5.1
2. View output of dpkg -l | grep gamemode:

$ dpkg -l | grep gamemode
ii  gamemode                                   1.5.1-0ubuntu3.1                      amd64        Optimise Linux system performance on demand
ii  libgamemode0                               1.5.1-0ubuntu3.1                      amd64        Optimise Linux system performance on demand (libraries)
ii  libgamemodeauto0                           1.5.1-0ubuntu3.1                      amd64        Automatically optimise Linux system performance on demand

3. View output of gamemoded --version:

$ gamemoded --version
bash: /usr/bin/gamemoded: No such file or directory

Expected behavior bootstrap.sh script should:

1. detect existing pre-installed gamemode
2. suggest uninstallation of it to a user before running again bootstrap.sh script
3. display command to uninstall the pre-installed gamemode, e.g. sudo apt remove --purge gamemode
4. display information that the pre-installed version can be installed again using sudo apt install gamemode
5. be closed

System Info:

• OS and version: Ubuntu 20.04 LTS
• GameMode version: v1.6-dev

[stephanlachnit]

This is a funny one. I guess the easiest way would be to simply check if /usr/bin/gamemoded exists, and ask the user if he wants to really install it (with the hint that it potentially breaks the installtion from the package manager).