Comment 5 for bug 2017292

I have the same identical issue, installation get stuck (forever) on:

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Jun 24 23:51:23 ubuntu subiquity_log.3190[4883]: Running command ['umount', '/tmp/tmpcpy6gu_o/mount/proc'] with allowed return codes [0] (capture=False)
Jun 24 23:51:23 ubuntu subiquity_log.3190[4883]: Running command ['mount', '--make-private', '/tmp/tmpcpy6gu_o/mount/dev'] with allowed return codes [0] (capture=False)
Jun 24 23:51:23 ubuntu subiquity_log.3190[4883]: Running command ['umount', '/tmp/tmpcpy6gu_o/mount/dev'] with allowed return codes [0] (capture=False)
Jun 24 23:51:23 ubuntu subiquity_log.3190[4883]: finish: cmd-apt-config: SUCCESS: curtin command apt-config
Jun 24 23:52:26 ubuntu subiquity_event.3190[3190]: configuring apt
Jun 24 23:52:54 ubuntu subiquity_event.3190[3190]: subiquity/Ad/has_support_GET