pi:~ $ sudo apt-get update Hit:1 http://archive.raspberrypi.org/debian buster InRelease Hit:2 http://raspbian.raspberrypi.org/raspbian buster InRelease Reading package lists... Error! E: Encountered a section with no Package: header E: Problem with MergeList /var/lib/apt/lists/raspbian.raspberrypi.org_raspbian_dists_buster_main_binary-armhf_Packages E: The package lists or status file could not be parsed or opened.
There is a problem with your lists of packages which are contained in the repository. You can try to reinitialize the lists under control of the package manager. How to do that you can look at Raspberry Pi sudo apt-get update not working.
sudo rm /var/lib/dpkg/status sudo touch /var/lib/dpkg/status
If that doesn't work try this:
sudo rm /var/lib/apt/lists/raspbian.raspberrypi.org_raspbian_dists_buster_main_binary-armhf_Packages sudo touch /var/lib/apt/lists/raspbian.raspberrypi.org_raspbian_dists_buster_main_binary-armhf_Packages