gdebi will look for all the dependencies of the .deb file, and will install them before attempting to install the .deb file. I find this much preferable than sudo dpkg -i skype.deb && sudo apt install -f.
How do I install a .deb file via the command line? - Ask Ubuntu
I have a deb package for installation. Shall I install by dpkg -i my.deb, or by apt? Will both handle the software dependency problem well? If by apt, how can I install from the deb by apt?
How to install a deb file, by dpkg -i or by apt?
If you do this in a tmp dir, the deb file will be cleaned up whenever you empty your tmp folder. Otherwise you can manually delete the deb package if you need the disk space.
Is it possible to install a .deb from a URL? - Ask Ubuntu
A .deb file is an archive (extract it via ar x package.deb or just list contents via dpkg -c package.deb) with the following contents: data.tar.xz, control.tar.gz, debian-binary data.tar.xz Extract this archive via tar -xvf data.tar.xz and you will have the actual files in the folder structure where they will be installed. All programs are already compiled (in contrast to downloading source ...
What does Linux do when it runs a .deb file? - Unix & Linux Stack Exchange
A lot of people compare installing software with apt-get to rpm -i, and therefore say DEB better. This however has nothing to do with the DEB file format. The real comparison is dpkg vs rpm and aptitude / apt-* vs zypper / yum. From a user's point of view, there isn't much of a difference in these tools. The RPM and DEB formats are both just archive files, with some metadata attached to them ...