System upgrading from 8 to 9

[Oulik]

Tried it according to the Wiki. Gave me errors flashing past about untrusted etc, after 30 minutes doing its thing, stills stuck on Three sisters 8.3.
Then after restarting it downloaded another 2GB and it took another 30 minutes. That seemed to do the trick.

I wanted to remove this, because eventually it got solved, how do I remove or delete a post?