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Method 1
ps aux | grep -i apt
sudo kill -9 <process_id>
Method 2
sudo lsof /var/lib/dpkg/lock
sudo lsof /var/lib/apt/lists/lock
sudo lsof /var/cache/apt/archives/lock
sudo kill -9 <process_id>
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sudo rm /var/lib/dpkg/lock-frontend
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
sudo apt-get install typespeed
sudo apt install openssh-server
sudo apt install ssh
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sudo killall apt-get
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sudo lsof /var/lib/dpkg/lock
or
sudo lsof /var/lib/apt/lists/lock
or
sudo lsof /var/lib/dpkg/lock-frontend
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sudo must be used before and after &&
Example:
sudo apt-get update && sudo apt-get upgrade
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#You can delete the lock file with the following command.
sudo rm /var/lib/apt/lists/lock
#You may also need to delete the lock file in the cache directory
sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock
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// This occurs due to permission denial
// simply add sudo
sudo apt install something
// Then input your password
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for linux lock