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I am using Ubuntu xenial (16.04.1) Problem is: kernels can not be updated or I cannot upgrade to 16.10, because after 'aptitude upgrade' or 'dorelease-upgrade -d' I get: 'could not execute 'apt-key' to verify signature (is gnupg installed?)' gnupg is already the newest version (1.4.20-1ubuntu3.1) on my system

how to fix? recommendations from googling did not help me.

Zilberbot
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