How to upgrade Ubuntu from an ISO image
I have Ubuntu 10.10 installed. Kindly let me know if there are upgrades for changing my version of Ubuntu. Thank you for your kind help.
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For upgrading Ubuntu, go to the Update Manager. It has to tell you that a Ubuntu update is available since you are still on 10.10. If it does not tell you this, go to Software Sources to ensure that you allow the system to propose you Ubuntu updates when they are available. Once you see that a Ubuntu update is available on the Update Manager, click on the button near it and follow the instructions. Note that it might propose you intermediate upgrades before 12.10. I especially think to 12.04 LTS.
You could only upgrade from 10.10 to 12.10 by first upgrading to 11.04, 11.10, then 12.04 LTS, and finally to 12.10 ..
However, Ubuntu 10.10 (Maverick) is no longer supported, and so upgrading from 10.10 to 11.04 is also not supported.
Once you have your data and settings backed-up, you should do a fresh install of Ubuntu 12.04 LTS on your PC. There may be initial issues with drivers, but this should mostly be resolved by doing an update.
Once you have 12.04 LTS working, then try out (but do not immediately install) Ubuntu 12.10. This should also work on your PC, but will in turn be replaced by 13.04, etc.
I have successfully run 12.04.1 LTS on an HP Mini netbook (Atom processor, 1GB RAM) or ex-corporate desktops (P4 2.8GHz, 1GB RAM).
Actually 11.04 is also no longer supported.
The problem is that for releases that are no longer being maintained, upgrading from these releases may have issues which are not likely to be resolved. The release being upgraded to also needs to be supported, otherwise the user is on their own.
Ubuntu / Canonical do support longer usage (without upgrading), but only for the Long Term Support (LTS) iterations. These are usually released only every two years.