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some other process automatically locks /var/lib/dpkg/lock for few minutes when restarting my system.

I am running Debian buster a.k.a. Debian testing. From the last couple of weeks, whenever I reboot the sytem i.e. going to CTRL+ALT+F1 and run

$ sudo reboot

it reboots the systems as normally but when it comees to on the desktop after logging in, I always get -

$ sudo aptitude autoclean
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
Freed 0 B of disk space       

and I have to wait around 5 minutes before I can run the command. It can't be memory or system constraints as free shows -

$ free -h
              total        used        free      shared  buff/cache   available
Mem:           7.7G        634M        6.3G         94M        726M        6.8G
Swap:           59G          0B         59G

and can't be the chip as it's a pretty new Skylake i5 5400