IMO this is fixed in latest unattended-upgrades version available via
-updates.
** Changed in: unattended-upgrades (Ubuntu)
Status: New => Fix Released
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** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1731798
Title:
package unattended-upgrades 0.90ubuntu0.7 failed to install/upgrade:
subprocess new pre-removal
