Comment 3 for bug 2025192

Ditto. Looks like 2 packages are unavailable:
linux-modules-extra-5.15.0-76-generic
linux-modules-5.15.0-76-generic

===== sudo apt install --download-only linux-modules-extra-5.15.0-76-generic
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package linux-modules-extra-5.15.0-76-generic 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 'linux-modules-extra-5.15.0-76-generic' has no installation candidate
=====

===== sudo apt install --download-only linux-modules-5.15.0-76-generic
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package linux-modules-5.15.0-76-generic 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 'linux-modules-5.15.0-76-generic' has no installation candidate
=====