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This fixes the `invalid command 'bdist_wheel'` error which may be causing wider problems, as reported in this email thread: https://www.mail-archive.com/gem5-dev@gem5.org/msg39790.html The `bdist_wheel` package, a dependency of the `celery` package, was not being installed correctly. The root cause of this problem is not known, but solutions are presented here: https://stackoverflow.com/questions/34819221/why-is-python-setup-py-saying-invalid-command-bdist-wheel-on-travis-ci Upgrading pip prior to installing the gem5art packages seemed like the simplest solution. Change-Id: I1bd4e85871c37d0522e16a90ff6b8acc3fdd9f94 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49044 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>