What happens after 14.10 expires? Can I upgrade to 15.10 or do I have to reinstall?

Solution 1:

• You can not directly upgrade from 14.10 to 15.10
• If you want to go from 14.10 directly to 15.10 you need to re-install.

• You can upgrade from 14.10 to 15.04, and then from 15.04 to 15.10

• When 14.10 expires, support on Ask Ubuntu ends

• When 14.10 expires, you do not get any more updates. If you can live with that you can keep using 14.10 till the end of the world. It is not advised though. We suggest you upgrade to 15.04.

Solution 2:

Here is the schedule of the Ubuntu releases.

You may want to read

• https://wiki.ubuntu.com/Releases
• http://www.ubuntu.com/info/release-end-of-life