17.04aptsoftware-center
When I double click the .deb file it opens up in the Ubuntu Software app.
However, clicking the "Install" button doesn't do anything – no popups or errors, like I didn't even click it.
I can install the packages from the terminal by running
sudo dpkg -i *package_name*
sudo apt-get install -f
But I'd like to have my Ubuntu Software fixed. Any ideas?
I have had this problem too (I was trying to install logmein hamachi), you should install gdebi package manager. It worked to install debs on my machine. Hope it helps!
For some reason, both my Ubuntu Software Center (now simply called "Software") and the Snap Store weren't present on my Fresh Ubuntu 20.04 install. To install them, simply run the following two commands:
sudo apt install gnome-software # "Software"
snap install snap-store # Snap Store
Here's what their icons look like now when I press the Super key (Windows key on a PC keyboard, or Command key on a Mac running Linux), then search for them:
Ubuntu Software Center (now just called "Software"):
Ubuntu "Snap Store":
Now, to install a *.deb file using the GUI file manager, such as nautilus (default), or nemo (my preferred choice), simply right-click the *.deb file and go to --> Properties --> "Opens With" tab --> select "Software Install" (which is now available since you just installed gnome-software) --> and click "Set as default" --> Close.
Now you can just double-click the *.deb file in your GUI file manager to install it!
Note: you might also consider trying the gdebi package installer, as described here: Problem installing .deb in Software Install Ubuntu 20.04. Apparently, in some cases where the "Software Install" GUI option fails, and you would have to otherwise manually run sudo dpkg -i myfile.deb to install the *.deb file, the "GDebi Package Installer" GUI option works.
gnome-software and the snap-store: Ubuntu Software doesn't open in Ubuntu 20.04
Best Answer
Use gdebi to install packages. How to install:
Solved the problem for me.