To upgrade from Ubuntu 11.04 on a server system: install the update-manager-core package if it is not already installed; launch the upgrade tool with the command sudo do-release-upgrade -d; and follow the on-screen instructions. Note that the server upgrade is now more robust and will utilize GNU screen and automatically re-attach in case of e.g. dropped connection problems.
Download the Ubuntu Oneiric Beta 2
1. Improved handling of 32-bit compatibility on amd64 systems
2. Enabling multiarch if you upgraded before Beta-1
3. Ubuntu Kernel Beta 1 includes the 3.0.0-9.15 Ubuntu kernel which is based on the v3.0.3 upstream stable kernel. Some of the most notable changes since Ubuntu 11.10 Alpha3 with respect to the kernel include:
Rebase to v3.0.3
Enable missing IPv6 options
Ivy Bridge: KVM support for SMEP
Fix integer math bugs in panel fitting
Turn on extra EAPDs on Conexant codecs
Deliver more Atheros, Ralink, and iwlagn NIC drivers to d-i
Package macvlan and macvtap for virtual
Package x86_energy_perf_policy and turbostat
dell-wmi: Add keys for Dell XPS L502X
hfsplus: ensure bio requests are not smaller than the hardware sectors
Ecryptfs: Add mount option to check uid of device being mounted = expect uid
Update ideapad-laptop to v3.1
mac80211: be more careful in suspend/resume
xen-blkfront: Drop name and minor adjustments for emulated scsi devices
xen: Do not enable PV IPIs when vector callback not present
Native driver support for changing backlight intensity on i915
Numerous config updates
4. Revised DVD content. With 11.10 Beta 1, we’re introducing a revised smaller DVD based on community feedback over the last few cycles. This new DVD has a more manageable size of 1.5G. The new DVD image is an extension of our current CD image to include all the language packs and some other useful applications, such as Inkscape, GIMP, Pitivi, and a more complete LibreOffice suite. All the packages that used to be on the DVD are still available from the archive.
5. Interface updates
A new release of compiz and Unity has been included with this milestone. Highlights of this release are:
A new Alt+Tab switcher.
“Places” were renamed to “Lenses”, now integrating multiple sources and advanced filtering like ratings, range, categories. A new music lens linked to Banshee is also installed by default. The restructuring for getting some new features has been done. Known bugs and regressions are documented below.
Better performance of launchers and panel, ported to GTK 3 and GTK 3-based indicator stack.
Also check [Guide] Installing Ubuntu 11.10 Oneiric in VMware Workstation 8