I installed Ubuntu alongside Windows 7, but when I reboot the computer I cannot switch between the two systems. How can I solve this problem?
2 Answers
If your grub is not listing both Ubuntu and Windows try using Boot Repair.
If you are unable to access Grub I would take a look at this question about restoring grub.
Try to update grub menu. Boot into Ubuntu and open terminal (ctrl+alt+t) enter the command
sudo update-grub
Restart to see if worked or not.
If that did not work then use Boot-Repair