how to manually upgrade from 15.04 to 15.10 so I can upgrade fully

Question

Getting the error an upgrade from vivid to xenial is not supported. I need to know how to manually upgrade from v 15.04 to 15.10 so I can then upgrade to 16.whatevs as per usual.

I have tried

sudo do-release-upgrade 

and used the software updater program, and both return the same error. I do not want to skip versions from 15.04 to 16.x, I just want to manually install 15.10 from my current version, and that should allow do-release-upgrade to fix the rest.

Solution

Set

software & updates -> Updates -> Notify me of a new Ubuntu version

to

For any new version

and run

sudo do-release-upgrade -d

I thought -d was for servers only, but evidently not.

Comments

[Joel McKay]

I don't think so. I don't want to skip releases, I just want to proceed up the ladder to the latest release and I can't. Using software updater gives me the error mentioned in my original post, and I can't see any other method of installing upgrades. I've tried sudo do-release-upgrade and get the same error.

[Joel McKay]

was missing the -d. Finally got it working, thanks for the help :)

[Waqar Alamgir]

-d is for development releases.