When I started installing the final version, I faced some problems. There is nothing huge about it, major releases like these are expected to have some minor bugs.
However, there are certain bugs that you should be aware of. We will also suggest workaround to avoid getting bitten by these nasty bugs:
6 Alert Level - Orange
After selecting "Continue testing" rather than "restart now" you will not find any GUI option to restart the machine.
5 Alert Level - Orange
The system occasionally fails to reboot after completing the installation and clicking 'Reboot Now'.
4 Alert Level - Orange
When installing the amd64+mac version, please do not use LVM. Also avoid using multiple linux instances at this time.
3 Alert Level - Orange
Even if no Internet access is available during installation, the desktop CD installer offers checkboxes to install third-party software and software updates. These options may not work properly without Internet access.
2 Alert Level -- Red
Selecting "Configure encrypted volumes" in the alternate/server installer initialises encrypted volumes from scratch, and will destroy any encrypted data that was previously present. There is no way to reuse an existing encrypted volume at installation time at the moment, although we do consider this a bug that will be fixed in a future release.
1 Alert Level -- Red
The manual mount point entry box in the desktop installer's partitioner does not accept keyboard input. The drop-down still works, so various standard mount points may be selected, but custom ones cannot. This was noticed too late to be corrected for 11.04. In the meantime, you can mount partitions manually later, or use the alternate install CD. (Muktware has published a blog about how to mount your partitions after Ubuntu 11.04 installation.)