Comment 26 for bug 1624644

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Jarno Suni (jarnos) wrote : Re: By default settings unattended-upgrade is unable to automatically remove packages that become unused in conjunction with updating by other software.

Anyway, in my view
Unattended-Upgrade::Remove-Unused-Dependencies "true";
would be the default setting to have now, and advanced users should mark the dependencies of their unpackaged software as "manual".