Gnome-software doesn't install flathub apps

I'm using a 2014 MSI GE60 2PC Apache, Intel® Core™ i7-4710HQ CPU @ 2.50GHz × 8 processor, NVIDIA Corporation GM107M [GeForce GTX 850M] GPU (don't know if they're relevant but wanted to mention).

I'd been using Zorin 16 for 3-4 months, never had a problem. Then I got an SSD and made a fresh install. After that, I couldn't install flathub apps from gnome-software. They are shown in it, I click install, it acts like it installs, but it's stuck at 0%. Here's a screenshot;

It doesn't have any problem with snap or ubuntu-focal-universe apps. I tried "sudo apt-get install --reinstall gnome-software", also "gnome-software-plugin-flatpak", removed gnome-software then reinstalled, did the same for flatpak, changed "download from" to main server and to other different servers, run package and software updater, everything's up to date.

It's starting to drive me crazy here. Any help is appreciated. Cheers.

Did you add the flathub remote?

    flatpak remote-add --if-not-exists flathub

Yes, I did! But no help, unfortunately.

I would do the install from the terminal:

flatpak install flathub md.obsidian.Obsidian

and move on.

This has been an ongoing issue which is surprising given that the Software app and flatpak are both developed by the Gnome Foundation.

You might try

killall gnome-software

rm -rf ~/.cache/gnome-software

sudo apt install --reinstall gnome-software -y

To see if a complete removal of all cached or configuration files along with reinstalling gets things working.
But as this is an ongoing bug... @Topaz may be correct in using the terminal as your go-to tool for installing desired applications.

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Thanks for the input. Looks like I'll just use the terminal until this problem miraculously goes away.

Nothing works. Looks like only solution is to use the terminal right now. Thanks!