I installed ubuntu 12.10 lately. But some problems seemed to occur.
- Brightness control not working.
- Mouse flickering randomly.
I downloaded a newer version of ubuntu 12.10 and after booting it as live found out that these problems is fixed in that version.
I found out that some files like sys->class->backlight was empty in the first one.
How can I upgrade my current installed version with the newer one or repair it using bootable disc of the newer version, so that I dont need to reinstall all the softwares.