[Bug 1931297] [NEW] 'update-manager' E:can not open /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_focal-backports_InRelease - fopen (13: Permission denied), E:The package lists or status file could not be parsed or opened.

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Ubuntu 20.04.2 LTS
08jun21
System 
Could not initialize the package information 
An unresolvable problem occurred while initializing the package information.
Please report this bug against the 'update-manager' package and include the following error message: E:can not open /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_focal-backports_InRelease - fopen (13: Permission denied), E:The package lists or status file could not be parsed or opened.

This error actually does not let the system Update properly . Looking
for some help on the matter. Like How did this happen? How to fix the
issue at hand as well as how to keep this from happeing again.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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'update-manager'  E:can not open /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_focal-backports_InRelease - fopen (13: Permission denied), E:The package lists or status file could not be parsed or opened.
https://bugs.launchpad.net/bugs/1931297
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