I installed Ubuntu 12.10 but I can't reach it. The boot page doesn't appear and I can't choose which OS I want to use. It goes directly to Windows 8.
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2I guess you installed windows after ubuntu? – Dr_Bunsen Nov 04 '12 at 20:56
3 Answers
Probably is the windows bootloader installed, you have to replace that one with grub, you can do this with Resc-A-Tux
This is a live cd with a primary goal: Restoring grub/installing grub. It's a nice program which I used after windows just removed my grub without asking, and it worked like a charm.
When you boot it up, a popup pops up. In this popup you can select install/repair grub. Select this, it will ask some stuff, but if you click ok, it will install grub as it is always installed as default.
A small tip: Always install Windows first, since Windows just throws away grub without asking.
Rescatux features:
Fixes GRUB and GRUB2
Regenerates Debian/Ubuntu grub menues
Check and fix filesystems
Fixes Windows MBR
Blank Windows passwords
Boot Info Script
Change Gnu/Linux password
Regenerate sudoers file
Extra tools:
Synaptic
Gparted 0.7

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I also experienced this and I can confirm this worked for me and other computers
sudo gedit /etc/default/grub
then find the line #GRUB_GFXMODE delete the number sign (uncomment) and replace the resoltion with 1024x768 save it
then run sudo update-grub
so sorry I misread your question you cannot boot into ubuntu my mistake

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