I'm unable to update any packages on my 20.4.4 distribution. When I do 'sudo apt update', I get:
Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:2 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease [18,1 kB]
Get:3 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [2 082 kB]
Get:4 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal/main Sources [3 632 B]
Get:5 http://fr.archive.ubuntu.com/ubuntu focal InRelease [265 kB]
[...]
Get:110 http://fr.archive.ubuntu.com/ubuntu focal-backports/universe amd64 c-n-f Metadata [880 B]
Get:111 http://fr.archive.ubuntu.com/ubuntu focal-backports/multiverse amd64 c-n-f Metadata [116 B]
Fetched 53,9 MB in 18s (3 028 kB/s)
Reading package lists... Error!
E: Problem parsing dependency 21 of openssh-server:amd64=1:8.2p1-4ubuntu0.2
E: Error occurred while processing openssh-server (NewVersion2)
E: Problem with MergeList /var/lib/dpkg/status
E: The package lists or status file could not be parsed or opened.
I tried sudo rm -rf /var/lib/apt/lists/*
then sudo apt update
but it returns the same error.
I really don't know what to try or do. Thanks in advance for your help on this!