From my experience with installing Ubuntu, I have never been able to physically choose which partition the OS is installed on. As long as I had an unallocated partition, it did the job. However, I want to install Ubuntu on a currently occupied partition. So in order to overwrite this partition with Ubuntu, how can I select which partition Ubuntu gets installed on?
Thanks!
Everything you need is in the Something else option when you reach the partitioning menu during the installation process. In there you can select the existing partition you want to use, erase the current contents and instruct the installer to mount it as root partition.
This is not the only thing you need to do though since you probably need to create a swap partition too and select a place to install grub. If you are not familiar with these tasks, this may help you.
Backup all your data before you start this process since there is a great chance you might make unrecoverable mistakes. Be very careful.
