Install a .deb package: .deb files are like .exe files on Windows. You download them from the Internet yourself, and they install in just a few clicks. To install the package either double-click it, or right-click on it and choose "Open With GDebi Package Installer". Enter your password if prompted. The rest should be automatic.
I have the following scenario:
At first time using a new software, I download from site the latest or desired release.
Say I use the .deb package.
1) If installation using .deb package (and this package does not exists in Software Manager),
does it show up in Software Manager after install?
If not, how do I undo the installation?
2) Say the existing package in LM 17 is two or three releases ahead of my current package.
How do I update to latest or desired release (say one release behind the latest release) after the above installation?
3) If package in Software manager is several releases behind latest release,
how do I install with a newer release ( not necessary the latest release ) from within Software Manager?
[It does not look like this can be done. ?? ]
4) For installation outside software manager, does it show up in update manager?
If not, how do I enable it to show up in update manager?