A week after the downgrade, I did an "apt update" and "apt upgrade" and
I think <cups> was also upgraded. Since then, <cupsd> has seemed
satisfied with resources under 1%, so my impression is that my problem
is solved. However, I have no idea what is going on with this bug (that
I reported). The status here remains "incomplete", the importance is
still "undecided" and the bug is "unassigned".

It is as if the bug had somehow solved itself. Or is the status still
"incomplete" due to a fault of mine? What should I do?

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https://bugs.launchpad.net/bugs/1835957

Title:
  cupsd gobbles up resources

Status in cups package in Ubuntu:
  Incomplete

Bug description:
  My computer has got very slow since 4 or 5 weeks. Finally, I checked
  resource usage with <top> and the culprit seems to be cupsd. Here is
  an output line from a few minutes after boot:

  30900 root      20   0  305452 287396   5768 S   5,3  9,3   0:41.34
  cupsd

  Then after an hour and a half (with nothing printed):

  30900 root      20   0 2565692 2,125g   2240 R  79,0 71,9  93:01.45
  cupsd

  So %CPU grows 5,3 -> 79,0 and %MEM, 9,3 -> 71,9. Not good.

  A user on a local forum asked whether printing anything helped, and,
  certainly, it did. After I did (print something), cupsd was happy with
  less than 1% of CPU and MEM.

  So if I print something after every boot, the problem does go away.
  But that is not really a solution, is it?

  Running Lubuntu 16.04.6 LTS (32-bit). cups version is
  2.1.3-4ubuntu0.9.

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