[Tails-dev] Please review'n'merge bugfix/no_passwordless_sud…

Hi,

bugfix/no_passwordless_sudo fixes a regression found by testing
0.19~rc1.

Candidate for 0.19.

No ticket that should be closed or marked pending, but the issue is
described on todo/better_fix_for_LIVE_NOCONFIGS_bug.

Cheers,
--
intrigeri
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