Going from Unity 6 preview to Unity 6 LTS causes package manager errors

I’ve just tried updating my project from Unity 6 preview to the newly-released Unity 6 and I had to open the project in safe mode because there are errors. The errors appear to all be related to core Unity packages:

Please advise if there is a straightforward way to resolve this!

are there updates in package manager?

i just deleted the PackageCache folder inside /Library and re-opened the project and everything is working once again!

i have an issue where importing my project from 2022 LTS and causes errors when upgrading to the new unity 6 LTS. Are there any tips to solve the same?