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I've been running Ubuntu 20.04 since it came out. Today the Ubuntu Software app is telling me that there's an update to Core 18 ("Runtime environment based on Ubuntu 18.04"). I don't have a update source that appears to cause this. Is software from 18.04 part of 20.04? Should I perform the update?

karel
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Leonard
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  • You haven't said if you're running a desktop , server or what type of install, however I'll assume from 20.04 you're using a *yy.mm* debian based install. The Core 18 I think it's talking about is a *snap* ("*core18 20200427 canonical✓ base Runtime environment based on Ubuntu 18.04*" as seen with a `snap search core18` on my *groovy* box). It's talking about the Snap core18 I believe; my *groovy* box having both *core18* and *core20* installed. Sorry I upgrade packages by terminal so have little experience of how it shows in apps. – guiverc Jul 14 '20 at 00:54
  • Thanks for your reply. I'm running desktop. "snap list" shows both "core" and "core18". I don't have "core20". Is the system supposed to have both core18 and core? My naive guess is that core18 shouldn't be present in a 20.04 system. – Leonard Jul 14 '20 at 01:21
  • I'd suggest waiting for others to respond, or provide input too. I don't see any problem with updating the *snap* (you can updates snaps with `snap refresh`) but my knowledge in this area is incomplete sorry. – guiverc Jul 14 '20 at 01:24
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    Three core snaps are available, `core` (based on 16.04), `core18` (based on 18.04) and `core20` (based on 20.04). The core snaps are runtime environments, other snaps are built on them. Which of the core snaps are installed in your system depends on other snaps installed, the core snaps are pulled in as dependencies. Since the snap `snap-store` should be installed in your system, `core18` should also be installed. [This question](https://askubuntu.com/a/1236201/590937) might be interesting for you. – mook765 Jul 14 '20 at 06:35

2 Answers2

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The Software app in 20.04 has a bug that notifies the user of an update to a package that isn't installed. If you ignore this notification it disappears the next time you open the Software app and it never comes back.

I have core and core18 snap packages installed in 20.04. core18 was automatically installed as a dependency of another snap package. The software app in 20.04 has a bug in it that it shows an available update for a snap package that isn't installed, for example core16. When you click the Update button a notification pops up that says Unable to update core: snap has no updates available as shown in the screenshot, even though the results of snap list show that the core16 snapd-runtime environment is not installed. Not only that but core16 does not have a stable channel, only beta and edge candidates, so I ignored the green number next to Updates on the toolbar. The next time I opened the Software app the Update notification for core16 was gone, and it has never reappeared since then.

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karel
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Core snap list

I have found the same on my system & continue trying to update, then ignore it until the next time the update message appears.

user1704298
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