Problem solved :
1) gksudo gedit /etc/default/grub
2) Change line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to add : pnpbios=off acpi=force irqpoll
The line is now :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pnpbios=off acpi=force irqpoll"
Save and quit gedit
3) sudo update-grub
4) restart the pc
It-s working now.
** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Committed
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https://bugs.launchpad.net/bugs/1023984
Title:
Ralink wifi problem in dual boot under Ubuntu 12.04
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