Comment 1 for bug 1783023

Thanks for taking your time to report this issue and help making Ubuntu better.

I've seen the same behaviour on my 18.04 system. It didn't use to show the update-manager window in older releases when only phased updates were available so it might be the removable kernels which are triggering it. (Or a combination of the two?)

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. This will automatically add version numbers and other relevant information. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.