Raspberry Pi4 upgrade error

Could not get lock /var/lib/dpkg/lock-frontend

Error sentence

Could not get lock /var/lib/dpkg/lock-frontend

Solution

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

sudo dpkg --configure -a
sudo apt-get update
sudo apt-get upgrade

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