Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend),
is another process using it?

I run fuser /var/lib/dpkg  and the pid that shows up is unattended-
upgrades which is chewing cpu.

If I run ps -ef | grep dpkg
nothing is running.   I don't know what unattended-upgrades is doing other than 
blocking me from running apt full-upgrade, but it's not actually running 
updates.   If I kill it, it just restarts.  I have to kill it and immediately 
start apt full-upgrade or wait an extended period of time for 
unattended-upgrades to let go.

I can't replicate the problem at this time because I've now manually run all 
the updates.
I'm not really interested in whatever slowness is in unattended-upgrades, I 
just want it to abort when I run apt if it isn't actually actively installing 
something.

unattended-upgrades should be communicating and coordinating with apt,
not blocking it unconditionally.

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https://bugs.launchpad.net/bugs/1883338

Title:
  unattended-upgrades blocks apt

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