Hi Daniel, welcome to the Linux Mint forums
Thanks for joining the forums! As to your questions:
- Update means to refresh your local index of packages available in the repositories (from where you install software normally). From this local index, the package management system (Debian's APT) can then figure out if there are any packages that can be upgraded on your system (if there are newer versions available in the repositories than you have installed on your system). So upgrading means to install those newer versions
- The command to upgrade but a single package is:
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sudo apt-get install --only-upgrade packagename
Where you replace packagename with the name of the package to upgrade. Note that this will also upgrade any dependency packages (for example if you upgrade some program, if the newer version requires newer versions of certain libraries those will also be upgraded). Generally easier to do this with the Update Manager. And I'm not sure why you would want to upgrade only one package. Generally the Update Manager keeps packages that may be pose a risk to your system's stability on the same version (see Edit > Preferences menu where you can configure level 4 and level 5 packages, which are normally not upgraded--things like kernel and graphics card drivers).
Be sure also to check out the Community
website (tutorials, hardware and software reviews, ideas), and the Cinnamon Spices
website for adding even more themes, applets and extensions to Cinnamon.
You can also chat in real-time with other Linux Mint users. In the Mint Menu, in the Internet section, start the application XChat IRC. You will automatically get connected to #linuxmint-chat for general chat and #linuxmint-help for support with other Linux Mint users.
Have fun with Linux Mint.