E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)

Best way to solve the problem of

E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

Solution from https://itsfoss.com/could-not-get-lock-error/

ps aux | grep -i apt

sudo kill -9 <process id>
sudo killall apt apt-get
lsof /var/lib/dpkg/lock
lsof /var/lib/apt/lists/lock
lsof /var/cache/apt/archives/lock
sudo kill -9 PID
sudo rm /var/lib/apt/lists/lock
sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock
sudo dpkg --configure -a
lsof /var/lib/dpkg/lock-frontend
sudo kill -9 PID
sudo rm /var/lib/dpkg/lock-frontend
sudo dpkg --configure -a

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