Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend)

admin

This may happen if

• 'Synaptic Package Manager' or 'Software Updater' is open.
• Some apt command is running in Terminal.
• Some apt process is running in background.
  
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For above wait for the process to complete. If this does not happen run in terminal:

sudo killall apt apt-get

If none of the above works, remove the lock files. Run in terminal: (Note that this can seriously break your system.)

sudo rm /var/lib/apt/lists/locksudo rm /var/cache/apt/archives/locksudo rm /var/lib/dpkg/lock*

then reconfigure the packages. Run in terminal:

sudo dpkg --configure -a

and

sudo apt update

That should do the job.