I keep reading conflicting information about upgrading from 14.04 to 15.10. This post here suggests that in order to upgrade to 15.10, I first need to upgrade to 14.10 and then 15.04 before 15.10, and skipping upgrades in between is generally a bad idea.
That's all well and good, but when I try to follow the instructions in the post, I get this when running do-release-upgrade -d:
Err Upgrade tool signature
404 Not Found [IP: 91.189.92.200 80]
Err Upgrade tool
404 Not Found [IP: 91.189.92.200 80]
Fetched 0 B in 0s (0 B/s)
WARNING:root:file 'utopic.tar.gz.gpg' missing
Failed to fetch
Fetching the upgrade failed. There may be a network problem.
There is definitely no problem with the network.
If I run the GUI Software Updater (after having changed release-upgrades from lts to normal), it suggests skipping right to 15.10!
On top of this, I then read the answer here that I can actually skip directly between LTS versions. I don't mind waiting for 16.04 LTS if I need to, but I'd prefer to do the incremental upgrades if its going to result in a more reliable system.
Could someone please explain the truth to me here? Because these seem contradictory.
EDIT: I tested the same steps on another machine also running 14.04 LTS, and the do-release-upgrade -d command worked, however it tried to upgrade directly to 15.10 and completely broke the system (wouldn't boot). So it seems like going directly to 15.10 is still a terrible idea. So what is the alternative upgrade path? Do I need to reinstall from scratch?
