Learn more: Get Ubuntu 11.10
Upgrading from Ubuntu 11.04
Improved handling of 32-bit compatibility on amd64 systemsTo upgrade from Ubuntu 11.04 on a desktop system, press Alt+F2 and type in "update-manager -d" (without the quotes) into the command box. Update Manager should open up and tell you: New distribution release '11.10' is available. Click Upgrade and follow the on-screen instructions.
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.
Ubuntu 11.10 Beta 1 enables "multiarch" support for installing 32-bit library and application packages on 64-bit systems. For all amd64 installs and upgrades, select 32-bit software, including skype and flash, will be installable directly using the same 32-bit packages that are used on i386 installations, without the need to install the ia32-libs compatibility package. For users this means 32-bit libraries will always be available at the same time as their 64-bit counterparts, even in the case of security updates, and users will only need to install those 32-bit libraries needed by the applications they have installed.Enabling multiarch if you upgraded before Beta-1
amd64 users who upgraded to oneiric prior to August 16th or who installed oneiric prior to alpha-3 will need to manually enable multiarch support on their systems to ensure they get the same experience (and see the same packages) as other users. This is as simple as running the following command:
$ echo foreign-architecture i386 | sudo tee /etc/dpkg/dpkg.cfg.d/multiarch
An apt-get update later, and you'll have access to the full array of i386 packages in addition to the amd64 ones.
Installing the correct skype package
As a result of this change, work has begun to deprecate the ia32-libs package, which no longer ships all the libraries that it did previously. Most 32-bit software will either be automatically transitioned to i386 packages on upgrade or will continue to work with the ia32-libs package in oneiric. However, the skype package has not yet been updated for this in oneiric. If you have the skype package installed you will need to manually switch to the i386 package by running:
$ sudo apt-get install skype:i386
For the final 11.10 release, this will be resolved by providing an automatic upgrade to an i386-only skype package.


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