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

1

**Describe the bug** I use Ubuntu 20.04 LTS with the pre-installed `gamemode v1.5.1` listed [here](https://git.launchpad.net/~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu/tree/desktop-minimal#n98). Installation of the `gamemode v1.6-dev` overrides environment variable of the pre-installed version. **To Reproduce** Steps...