couldn't be accessed by user '_apt'. - pkgAcquire::Run

Check the permissions of the specified user '_apt' and ensure it has the necessary privileges. You may use the 'chown' and 'chmod' commands to modify ownership and permissions accordingly.

sudo chown -R _apt:_apt /var/lib/apt/lists
sudo chmod -R 755 /var/lib/apt/lists

If the issue persists, you can try updating the package lists with the following commands:

sudo apt-get clean
sudo rm -r /var/lib/apt/lists
sudo mkdir -p /var/lib/apt/lists/partial
sudo apt-get clean
sudo apt-get update

Additionally, you may need to check for any ongoing processes that might be interfering with the package management system:

sudo lsof /var/lib/dpkg/lock-frontend
sudo lsof /var/lib/dpkg/lock
sudo lsof /var/lib/apt/lists/lock

If any processes are using these locks, identify and terminate them.

sudo kill -9 <process_id>

After performing these steps, attempt to run the package manager again:

sudo apt-get update
sudo apt-get upgrade