Possible Duplicate: Can I switch from ubuntu amd64 to ubuntu 32bit My brother installed 64 bit Ubuntu on my moms old PC (dualboot with winXP) and it runs very crappily. It is on Ubuntu 11.10 and I was wondering if there is any easy way of updating to 32 bit 12.04. I know on fedora when you insert instillation media on a computer that already has fedora it asks you if you want to install it over that fedora, is there anything like this for Ubuntu. THANKS!