If you want to remove the remote repository from which Flameshot was installed, you can use:
flatpak remote-delete flathub
However, this will only remove the remote if there are no other applications or runtimes installed from it. If you want to remove the remote even if there are other applications or runtimes installed, you can use:
flatpak remote-delete --force flathub
Remember to replace flathub with the name of the remote repository you used if it's different.
[Source: Brave A.I. search engine via Mojeek)
There is also flatsweep to get rid of leftover dross from flatpaks removed:
Side-coomment, sudo apt-get purge/remove seems a lot less hassle with APT packages than flatpak removal.
I'm only a few months ahead of you in learning this stuff. In my case it's a combination of asking here, getting better at searching when I need a command, and keeping some notes on things I found very useful. Aravisian's instructions on installing Nvidia drivers from the terminal for example I have in an Obsidian notebook.
I didn't actually know the install command for the flatpak version when I started answering you. I knew that flatpak was the base program, I knew that | grep <string> will filter a program's output for lines containing that string, and I knew how to be lazy and install the flatpak version from the software store. So I installed from the software store, did flatpak list | grep flame, got the name of it from that, uninstalled from the software store, tested flatpak install org.flameshot.Flameshot, and when it worked, I provided that. Swarfendor has much longer experience and may well have known the commands provided off the top of his head, but you can also see in his reply that he referenced Brave A.I. I didn't provide an uninstall command because I got lazy and it's easy to remove from the Software store, even if you use the command line to install it.
But yeah, knowing this stuff comes down to asking here until you know some commands, then using those commands with --help if they're for non-system programs or man <command> if they're for system commands or concepts. You can learn about the grep command I used with man grep for example. The more you pick up this way, the easier it is to search your preferred search engine to get more, and the better questions you can ask here.
When You open the Terminal and type flatpak --help You get an Overview of Commands. and when You want it for a specific command, You can type flatpak uninstall --help for Example.
You can do it in the Software Center. When You want to use the Terminal the Command from @swarfendor437 would be a good Solution:
If you still see the update available option it means that you have something else installed, probably that AppImage. It seems like I've missed a lot of replies... Is this still an issue?
With time and practice, research the task at hand and see what options exist. The internet is your friend, but avoid running commands randomly just because a blog from 2005 said so. And that includes answers produced by AI and stuff.
In your previous post, you used the quoting feature of the forum, but the format was incorrect. You can see the edits to your post by clicking on the pencil icon:
Also this site by a book author was recommended to me when I asked for general resources here: http://linuxcommand.org/
I'd also recommend watching this:
It's obviously NOT in depth, covering 60 commands in 10 minutes, but there's just enough there to think "that sounds useful," pause, and look it up or add it to your own list for later searching.
They look a bit for experts. I don't really want to buy the whole bundle (incredible value and amazing)and not use most of them - any ideas what to do with the ones not needed?
They have good value because it's a bundle, there's no other way about it. Just one of those books would already cost you a lot more.
I recommend you take a look the Linux Pocket Guide, which covers a lot of ground even for beginners. You can see the table of contents here:
You don't have to download the ones you don't want, as they are all books in digital format. Most of them you won't need as they are much more focused on individual tools and workflows. But the ones about Linux are pretty good, even if you might read them a couple of years from.
