Error The package lists or status file could not be parsed or opened while updating [duplicate]

I was trying to :

sudo apt-get update 

Didn't work with error:

Hit:1 buster/updates InRelease Hit:2 buster-backports InRelease Hit:3 buster-updates InRelease Hit:4 buster InRelease Hit:5 buster InRelease Unknown Multi-Arch type 'fore+gn' for package 'nxproxy' Problem parsing dependency 21 Error occurred while processing nxproxy (NewVersion2) Problem with MergeList /var/lib/apt/lists /ftp.hu.debian.org_debian_dists_buster_main_binary-amd64_Packages The package lists or status file could not be parsed or opened. Can't call method "policy" on an undefined value at /usr/bin/apt-show-versions line 53. Reading package lists... Error! E: Problem executing scripts APT::Update::Post-Invoke-Success 'test -x /usr/bin/apt-show- versions || exit 0 ; apt-show-versions -i' E: Sub-process returned an error code W: Unknown Multi-Arch type 'fore+gn' for package 'nxproxy' E: Problem parsing dependency 21 E: Error occurred while processing nxproxy (NewVersion2) E: Problem with MergeList /var/lib/apt/lists/ftp.hu.debian.org_debian_dists_buster_main_binary-amd64_Packages E: The package lists or status file could not be parsed or opened. 

1 Answer

To fix MergeList problem:

sudo rm -r /var/lib/apt/lists/* 

then:

sudo apt clean sudo apt update