Comment 17 for bug 1813768

Ubuntu 18.04 latest updates ... the above work around is not working for me. I get:

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rjwiii@athiest-geek:~$ sudo apt install apparmor-utils
[sudo] password for rjwiii:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package apparmor-utils is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'apparmor-utils' has no installation candidate
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When I do an 'apt search apparmor-utils' I get:

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rjwiii@athiest-geek:~$ apt search apparmor-utils
Sorting... Done
Full Text Search... Done
apparmor-utils/now 2.12-4ubuntu5.1 amd64 [residual-config]
  (none)
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I need to install the latest hplip because the new printer I purchased (M255dx) is not supported by the packages in in the repositories.