Comment 3 for bug 1978125

>There is no specific handling in apt for this, so where are you seeing this?

Open konsole, and do an

sudo apt-get -s install snapd

SHOULD RESULT in
$ sudo apt-get install snapd

Reading package lists... Done
Building dependency tree
Reading state information... Done
Package snapd 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 'snapd' has no installation candidate

It DOES for my 20.04 boxes, and the VM IMAGE for 22.04 which has not been touched with any updates since created... (we update that once in a VM) and it WAS PREVIOUSLY WORKING on this box, as I had just rebuilt it for 22.04 specifically.. went to do some testing with another program.. and had to cleanse the system before I could do the testing....

ON 22.04 it WILL INSTALL SNAPD!

I do NOT use "update manager"

>Is it possible you see this in a graphical update tool like update-manager?

This is *** CLI **** I do all updates via CLI for things... I do not do any auto updating ever.

I will occasionally use synaptic for GUI interface, when I need to search for something.... mostly to get package names, and the dump to the CLI to install.

>What does apt-cache policy snapd say?

FOR 20.04 and it correctly blocked I get:

$ sudo apt-cache policy snapd
snapd:
  Installed: (none)
  Candidate: (none)
  Version table:
     2.54.3+20.04.1ubuntu0.3 -10
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
     2.54.3+20.04.1ubuntu0.2 -10
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages

ON *** 22.04 *** which has been updated yesterday:
$ sudo apt-cache policy snapd

snapd:
  Installed: (none)
  Candidate: 2.55.5+22.04
  Version table:
     2.55.5+22.04 1 (phased 50%)
        500 http://us.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2.55.3+22.04 -10
        500 http://us.archive.ubuntu.com/ubuntu jammy/main amd64 Packages

     2.44.3+20.04 -10
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

I just tried this in my VM that I was testing with last night, and which was powered up, checked, powered down, and NO UPDATES were applied, and NOW IT IS PERMITTING snapd to be installed! Thankfully I didn't run with permission to complete (-s option!)

Testing with a 22.10 daily build ISO and it CORRECTLY BLOCKS things...