Unsure if a "me too" comment is useful, but also having this problem.
Using AMD Ryzen 7 PRO 4750U with Radeon Graphics.
Present on 5.13.0-28-generic, fixed by rolling back to
5.11.0-46-generic.
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Public bug reported:
I accidently installed the package from the 15.10 repo rather than the
PPA, this failed to install. Added the PPA, upgraded and running `unity8
-lxc-setup` yields:
```
usage: unity8-lxc-setup [-h] [--rebuild] [--test SECONDS] [--destroy]
[--update-lxc]
