One would assume that printer sharing can be set up in Ubuntu 13.10 (Saucy Salamander) by following the Network Printing with Ubuntu community wiki page in the Ubuntu documentation. I found, however, that the set-up for the print server, the machine that actually shares a printer, didn't actually work. I kept running into a "client-error-forbidden" message while trying to set up a client machine on the network.
I worked on a project lately where I needed access to a Windows file server. There are two (2) ways of doing this, as a regular user (available only to the person setting it up), and as root (the system administrator). Setting up the connection system-wide using the latter approach will allow read-only access by everyone on the system, but they won't be able to write to it.
I have a client who uses a Cisco VPN to protect their network, and I exclusively use Ubuntu in my consulting work. At the moment, they don't easily work together out-of-the-box, even though they should. To get access to their network, I was provided with a PCF file, used to configure VPN client software to connect to the VPN server. However, after importing the configuration file, I simply couldn't connect.