apt update issue: Problem parsing dependency

If you encounter this problem when doing 'apt update'

E: Problem parsing dependency 21 of libc6-dev-s390x-cross:all=2.31-0ubuntu7cross1
E: Error occurred while processing libc6-dev-s390x-cross (NewVersion2)
E: Problem with MergeList /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_focal_main_binary-amd64_Packages
E: The package lists or status file could not be parsed or opened.

Do these:

sudo rm -fr /var/cache/apt/archives/*

sudo dpkg --clear-avail

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

sudo apt update

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