Re: Transferring Ubuntu to another machine
Any machine that "barely runs" has serious problems, most likely hardware. Ubuntu is not some kind of miracle cure that will turn a rundown PC into a powerhouse; instead, current releases need much the same hardware capability as do current Windows versions.
If you have installed any restricted drivers, especially video and/or sound, in the current Ubuntu install, it may not boot on the other PC.
There are a couple of steps you should consider:
1) Live USB -- make a LiveUSB of the Ubuntu version you want to "migrate", boot the desktop from that and see how well it performs. IF there are any major problems, come back here with those before you make the move.
2) If there are no major problems, then use Clonezilla to image off the current Ubuntu setup to an external drive. Make a boot CD from Clonezilla, boot the desktop from it, connect up the external drive, and "restore" the saved image to that drive. This will allow you to keep using the current Dell to get technical help from the forums if the desktop won't network correctly.
Ubuntu 15.04 Mate, Mint 17.1; MS Win 8.1, Win10 TP.
Will not respond to PM requests for support -- use the forums.