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$ sudo apt-get install ./nordvpn-release_1.0.0_all.deb
E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 5194 (unattended-upgr) - open (11: Resource temporarily unavailable)
N: Be aware that removing the lock file is not a solution and may break your system.
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?
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