Could not get lock

Reading package lists... Done
E: Could not get lock /var/lib/apt/lists/lock. It is held by process 34612 (apt-get)
N: Be aware that removing the lock file is not a solution and may break your system.
E: Unable to lock directory /var/lib/apt/lists/

ps -ef | grep apt | grep -v grep
root       34565       1  0 03:39 ?        00:00:00 /bin/sh /usr/lib/apt/apt.systemd.daily update
root       34569   34565  0 03:39 ?        00:00:00 /bin/sh /usr/lib/apt/apt.systemd.daily lock_is_held update
root       34612   34569  0 03:39 ?        00:01:02 apt-get -qq -y update
_apt       34615   34612  0 03:39 ?        00:00:02 /usr/lib/apt/methods/http
_apt       34621   34612  0 03:39 ?        00:00:00 /usr/lib/apt/methods/gpgv
_apt       34787   34612  0 03:39 ?        00:00:00 /usr/lib/apt/methods/store

Related

• apt update

See also

• APT: wajig, apt-cache, add-apt-repository PPA, apt [ install | remove |purge | show | list | changelog | update | upgrade], do-release-upgrade, apt-mark, apt full-upgrade, sources.list, APT Automatic updates, unattended-upgrade, apt-transport-https, apt-get update, /etc/apt/, /etc/apt/apt.conf.d/50unattended-upgrades, /etc/apt/apt.conf.d/, /etc/apt/apt.conf.d/20auto-upgrades, apt-file, apt-utils
• lock, flock, Magnetic keyed lock