Thanks for your bugreport.
This looks like you /var/lib/dpkg/status file got corrupted (around line
20544) - this usually indicates either filesystem corruption, memory
issues or bad third party packages.
As a workaround, you may try to repair it manually, but make sure to
keep a backup.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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update and package manager crash
https://bugs.launchpad.net/bugs/226008
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