[Bug 1931297] Re: '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.

[Roman Grinyov]

I don't know if this is related or not, but I have a similar error and
when I click the corresponding icon in the notification area and then
"Show updates" (see attachment), then the file
[/var/crash/_usr_bin_update-manager.1000.crash] is updated:
https://pastebin.ubuntu.com/p/5MSWkVzfp3


** Attachment added: "screen-record-2022-04-18_20.45.01.mp4"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1931297/+attachment/5581506/+files/screen-record-2022-04-18_20.45.01.mp4

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https://bugs.launchpad.net/bugs/1931297

Title:
  '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.

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  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.

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