Alternatively you can also simply install it via Flatpak just by clicking on the "Install" button in the Flathub page for Firefox: https://flathub.org/apps/details/org.mozilla.firefox
This flatpak package is directly maintained by Mozilla.
Now I know what was going on
The ISP company that provide my internet has as poor DNS, so I changed the DNS to 22.214.171.124 and 126.96.36.199 to modem's configuration and now everything is updating.
All my sources.list.d/ files was poiting to bionic which it's the right thing to do.
So if anyone has this problem, please try to check your DNS first
Here's how I solved the flatpak update issue.
Update faltpak in Terminal.
One package org.freedesktop.Platform.GL.default found but got error when update.
List the installed package.
I found the same package is installed.
Uninstall that package.
flatpak uninstall [Application ID]
Update flatpak and it success.
There's a lot of content in this "question" so it's hard to fully understand what you're asking. It's often better to ask a succinct question if you want a succint answer, but I'll try and answer some of your points.
In summary, if you have forgotten your password, it's not just installing software you're going to struggle with. Changing certain ...
It looks like the file permissions on the flatpak folder in your home directory (or possibly your home directory as a whole) are broken. Have you possibly ran a GUI program with sudo or ran some script that could have caused this?
I'd start by resetting the ownership of the flatpak directory. To do this:
sudo chown -R ryan:ryan /home/ryan/.local/share/...
It is possible to manage system-wide Flatpaks from within AppCenter.
You have to add a system remote to make this functionality available.
To add Flathub as a system remote you would use the following command in Terminal.
$ sudo flatpak remote-add --if-not-exists --system flathub \
Once a system remote has been ...
It is not currently possible.
However, there is ongoing work to support this. I can't give a specific date as to when that feature would be ready, but I would hope it would be complete by the release of elementary OS 6.0
Then you must ask for this developers at git or Twitter. They are not using this forum. They have official channel on Facebook. Last time, about week ago they mentioned they are going to remove the password from the App Center. So eventually you can use terminal to install apps with
sudo apt install nameoftheapp
I would recommend using Eddy, which is a free .deb installer on the AppCenter.
How to use:
Install Eddy (A restart might be necessary)
Press the "Open" button. This will open the "Files" app.
Choose the Debian package you want to install.
This will automatically load into Eddy.
Now just press install. You might be prompted to type your password.
Wow, that was an awful suggestion.
Always, always, ALWAYS! make sure you can trust the deb you've downloaded.
Before you install a .deb
Before telling you how to install it, I would ask you to check if they have the software in:
flathub because then you can click install there, download the .ref, click it in files, and appcenter will ...