It seems there is a sporadic failure in Azure linux buildbots while installing dependencies with the following error. It also fails sporadically on separate PRs that trigger the build. I noticed it for the few days since README Azure badge had the error for a couple of days with Linux builds passing on Travis.

Error message : 

2018-09-19T09:08:43.7414966Z Hit:17 http://packages.erlang-solutions.com/debian xenial Release
2018-09-19T09:08:45.1584376Z Reading package lists...
2018-09-19T09:08:45.2045716Z E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
2018-09-19T09:08:45.2063210Z E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
2018-09-19T09:08:45.2200826Z ##[error]Bash exited with code '100'.
2018-09-19T09:08:45.2734828Z ##[section]Finishing: Install dependencies

Reference buildbot failure : https://dev.azure.com/python/cpython/_build/results?buildId=30061&view=logs

Adding Victor and Pablo for notification. I don't think this is a requirement but just something I noticed and it also blocks miss-islington from auto-merging backport PRs in some cases like https://github.com/python/cpython/pull/9401#issuecomment-422505327

Thanks