Actually all you need to do is to right click it. The softwarestore will open and install it. It will pull in the dependencies. Or you can install gdebi. It does the same.
For rpm if you are on Fedora (yum is deprecated)
Code:
sudo dnf install ./xxx.rpm
As said above, you can install .rpm packages on Debian based distros like Ubuntu with alien, but it doesn't always work, depends on the package you try to install. alien also works in reverse, it lets you install .deb packages on rpm based OSes. I used it for something years ago. On Ubuntu it creates a .deb file then you have to install either via apt, dpkg or by right click. On Fedora it converts the deb to rpm and automatically installs it as well. There may be some settings or options one could play with, but I didn't bother.
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