mirror: clean environment before running apt-get #1659
Merged
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For mirror testing, we run apt-get update on the host. By default, external commands run by subiquity inherit the environment variables set by the snap (including LD_LIBRARY_PATH).
We don't ship apt-get or its dependencies in the subiquity snap, so we want to reset LD_LIBRARY_PATH and other variables when running the command.
Not doing so leads to the following error when running the subiquity snap on a focal-based system:
Tested on lunar, jammy and focal.
https://bugs.launchpad.net/subiquity/+bug/2016280