Installing and running Ubuntu Mate on my Raspberry Pi 2 has been a hard won victory. Lessons in patience and tolerance as well as persistence and perseverance . I chose 3 direct download sites and each of the downloads broke a third of the way in. The fourth time I downloaded it but when I unzipped it there was a message to say I did not have all the files. In the end I used the torrent option on the Raspberry Pi site. For someone new, you can skip some of the information on the page because you might find it intimidating. There are 3 steps
1. Download the file
2. Unpack the file with 7-zip
3. Create the mirror image on your formatted SD card with Win32 Disk Imager
Use the official SD card formatter here. If you follow the Raspberry Pi site where the links to 7-zip and Win32 Disk Imager are , watch the video and proceed, then you should be all right. For me it took time. Hopefully it is more reliable for you. I’m glad to see Ubuntu , though, it’s an old friend. I have another SD card which boots up Debian Jessie and I have been setting that up better now I am a bit more familiar with it. Once you have the image on the SD card , the Raspberry Pi boots up with it. It is slow to get going but gets faster. Ubuntu Mate is running more slowly than Debian Jessie but it’s not too bad. I think it will improve as it settles in. I’ll let you know!