How to Fix ‘E: Could not get lock /var/lib/dpkg/lock’ Error in Ubuntu Linux
You see this error because some other program is trying to update Ubuntu. When a command or application is updating the system or installing a new software, it locks the dpkg file (Debian package manager). So you might have to wait for the process to complete. But "N: Be aware that removing the lock file is not a solution and may break your system."
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