Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

hi i have got stuck with a problem... i have installed ubuntu 12.04 LTS using windows installer wubi.. after the installation completed it asked for the reboot. i rebooted and for the 1st time ubuntu worked very fine. after shutting it down i cant boot it from windows boot manager. when i booted it a purple screen comes which turns into flickering screen.. so how to fix this... i have windows 7 64 bit os, radeon graphics...

share|improve this question
add comment

2 Answers 2

Windows boot manager doesn't detect non-Windows installations.

You must use grub. If you want a user friendly method, try the boot-repair tool from Ubuntu's website (link below). Use the bootable image, and get it running on a handy USB or spare CD, since it only runs in a linux environment.

You can use this application to reinstall grub2, and repair many installation errors. Try it out, and come back if you have trouble.

https://help.ubuntu.com/community/Boot-Repair

share|improve this answer
add comment

If it is wubi and a video issue, Boot-Repair will not fix it. It is past the normal boot issue repairs that Boot-Repair can resolve and into video issues.

Boot-Repair can add nomodeset to standard grub, but I do not think it can do that with wubi. Alternative may be radeon.modeset=0.

From grub menu use e for edit, scroll down to linux line and change quiet splash to nomodeset. Depending on version of AMD, you probably need the proprietary drivers.

https://wiki.ubuntu.com/X/Troubleshooting/VideoDriverDetection

https://help.ubuntu.com/community/RadeonDriver

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.