I have now upgraded all three of my laptops from 24.04.4 LTS to 26.04 LTS. Initially after some difficulties because the upgrade would not start with ‘sudo update-manager -d’. I was able to solve that problem using the commands ‘sudo apt purge lintian’, followed by ‘sudo apt autopurge’.
The issue with starting the upgrade has been reported on launchpad and a structural fix is being worked on. See: https://bugs.launchpad.net/bugs/2150319.
All three of my laptops now work completely properly, except for one minor detail that is still unclear, which I would like to report here to see if other users are also affected by it and, of course, especially to contribute to clarity about this and - if it is a bug - to help find a solution.
The problem concerns Livepatch, namely the fact that Livepatch does not appear in the top bar, as in 24.04, and previous versions, despite the fact that this option is set to ‘on’. The invisibility of the Livepatch status makes it difficult for users to determine whether Livepatch is doing its job properly and actually performing security updates while the system runs.
For the sake of completeness, I would like to mention that immediately after the upgrade there was uncertainty about the status of my Ubunto Pro subscription. The old, trusted Software&Updates app showed that all functions were ‘on’, including the ‘Show Livepatch status in the top bar’ function (see screenshot Appendix 1). The new Security Center app, on the other hand, indicated that Ubuntu Pro was only available for an LTS version of Ubuntu, even though I had upgraded to 26.04 after its official release as an LTS, but of course before the official invitation to existing users to upgrade from 24.04.4, as this will only happen after the first point release has been published. Unfortunately, at the time I did not make a screenshot of the original screen announcing the unavailability of Ubuntu Pro as a whole.
After searching within the community, I was able to solve the above-mentioned problem by running the following commands in the terminal:
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sudo snap connect desktop-security-center : system-observe
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sudo pro attach
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sudo pro enable livepatch
I don’t remember exactly in which order I executed those commands (1, then 2 and 3 or first 2 and 3 and then 1). Anyway, everything seems to be working fine now. All functions in Security Center are now also set to ‘on’, including the ‘Show Livepatch status in the top bar’ function (see screenshot Appendix 2).
Nevertheless, Livepatch does not/never appear in the top bar (see Appendix 3) and it is therefore impossible for users such as I to determine whether Livepatch’s functions are actually being executed. I have also submitted this text as a bug report on launchpad.
I have tried to check the functioning of Livepatch with the terminal command ‘canonical-livepatch status’ and ‘canonical-livepatch status –verbose’ (see Appendix 4) and this shows that the functions and procedures seem to be executed well and that the only problem is that the livepatch logo and the underlying clickable info does not appear in the top bar.
I hope this information can help the community and Canonical reconstruct and, if necessary, resolve the issue.
