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Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) Code Example
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? 
ps aux | grep -i apt

sudo kill <process_id>
# Check if the process was killed by running the ‘ps aux | grep -i apt’ command. If it is still running, force kill it with SIGKILL signal:

sudo kill -9 <process_id>
# Another, easier way would be to use the killall command. This will kill all the instances of a running program:

sudo killall apt apt-get
Source: itsfoss.com
Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) 
Try 'sudo apt-get update' or 'sudo apt-get upgrade'
E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) 
sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock
Source: www.linuxuprising.com
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root? 
sudo must be used before and after &&
Example:

sudo apt-get update && sudo apt-get upgrade
E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) 
sudo rm /var/lib/apt/lists/lock
sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock*
Source: askubuntu.com
E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) 
#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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Sub Category:
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