Cannot upgrade to 9.04

[sdd231163]

On running update manager on 8.10 I select 'upgrade'.

This gives me the release notes and I select 'upgrade' again.

Two files are downloaded for the upgrade tool.

I then get the following message: "Authentication failed - Authenticating the upgrade failed. There may be a problem with the network or with the server."

What do I need to do to upgrade?

Thanks,
Stephen.

[kshane]

On running update manager on 8.10 I select 'upgrade'.

This gives me the release notes and I select 'upgrade' again.

Two files are downloaded for the upgrade tool.

I then get the following message: "Authentication failed - Authenticating the upgrade failed. There may be a problem with the network or with the server."

What do I need to do to upgrade?

Thanks,
Stephen.

Try changing your software sources. That would be my first thing to try.

[sdd231163]

Tried changing the sources but to no avail.

[matthewboh]

I'm having a similar problem - I get the two files downloaded and then closes with no error message. One of the things that I've noticed is that if I go to System | About Ubuntu | Version and Release Numbers - they're not there. I've attached a screen shot. I'm currently running 8.10 on a dual boot machine with XP

[sdd231163]

I solved this:

I started update manager from a terminal using sudo:

sudo update-manager

Everything worked well from there.

[matthewboh]

I did this and it worked, but now Firefox doesn't work. It says that it can't reach the Internet, but I can ping anything out there

[sdd231163]

I don't know, but try uninstalling (purging) and reinstalling it?

[matthewboh]

Did that, but doesn't work. I find that I can hit some web sites but not others - on the exact same network, Ihave two other PC's and I don't have any problems - they both look like they're set up the same. I'm going to follow the forums about issues with firefox connecting