hi,i don't know if this is the right place for this topic,i did a full installation of ubuntu using wubi but when i restart my computer and select ubuntu from the bootloader i got this error: FAILED TO MOUNT SDA/DEV2:OPERATION NOT PERMITTED.

Try remounting after booting from a bootable medium. There's surely someone here who can give better advice than I.
My suggestion: throw Ubuntu away and use Arch Linux instead. Did so some months ago, best decision since I created a GOG account.

Sounds like the device names are improperly configured, perhaps changing which partition location is correct. Did you install from a USB or something?

Generally the devices are the type, logical drive number, partition. So /dev/sda1 would be your sd device, a is the first physical drive registered to the BIOS, and 1 being the partition number.

Probably your mount in /etc/stat.fs (i think that's the right name) will look something like this but separated by tabs (if memory serves me right)

[code]
/dev/sda1 / ext2 rw other_options
[/code]

It could also be the boot loader is improperly configured, a LILO or other configuration file will be located in your /boot/ directory.

Probably boot from your USB or CD that you used before and go into rescue mode to fix it, once fixed the system should boot normally.

What windows do you have? Wubi doesn't support the Windows 8 bootloader.

i have windows 8 :( which bootloader should i install?

Then you should do a normal install. Put the Linux distro you want on a CD/DVD/USB and install from there.

You can also try EasyBCD and add the Linux you have to the Windows bootloader screen, but I have no idea if it's gonna work with a Wubi install.

Thankyou ;)