solve ubuntu expired key server

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Update all expired keys from Ubuntu key server in one command:

sudo apt-key list | \
 grep "expired: " | \
 sed -ne 's|pub .*/\([^ ]*\) .*|\1|gp' | \
 xargs -n1 sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys

Command explanation:

    sudo apt-key list - lists all keys installed in the system;
    grep "expired: " - leave only lines with expired keys;
    sed -ne 's|pub .*/\([^ ]*\) .*|\1|gp' - extracts keys;
    xargs -n1 sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys - updates keys from Ubuntu key server by found expired ones.

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