This release of Ubuntu is no longer supported by Canonical. The support timeframe is between 18 month and 5 years after the initial release. You will not receive security updates or critical bugfixes.
It is still possible to upgrade this version and eventually you will be able to upgrade to a supported release of Ubuntu.
Alternatively you may want to consider to reinstall the machine to the latest version, for more information on this, visit: http://www.ubuntu.com/desktop/get-ubuntu
For pre-installed system you may want to contact the manufacturer for instructions.
If you would like to help shape Ubuntu, take a look at the list of ways you can participate at
http://www.ubuntu.com/community/participate/
Your comments, bug reports, patches and suggestions will help ensure that our next release is the best release of Ubuntu ever. If you feel that you have found a bug please read:
http://help.ubuntu.com/community/ReportingBugs
Then report bugs using apport in Ubuntu. For example:
ubuntu-bug linux
will open a bug report in Launchpad regarding the linux package.
If you have a question, or if you think you may have found a bug but aren't sure, first try asking on the #ubuntu or #ubuntu-bugs IRC channels on Freenode, on the Ubuntu Users mailing list, or on the Ubuntu forums:
http://help.ubuntu.com/community/InternetRelayChat http://lists.ubuntu.com/mailman/listinfo/ubuntu-users http://www.ubuntuforums.org/
You can find out more about Ubuntu on our website, IRC channel and wiki. If you're new to Ubuntu, please visit:
http://www.ubuntu.com/
To sign up for future Ubuntu announcements, please subscribe to Ubuntu's very low volume announcement list at:
http://lists.ubuntu.com/mailman/listinfo/ubuntu-announce