Most need secure boot off, although Ubuntu has the Microsoft key and should work with secure boot on.
If from Windows you have made unallocated space on hard drive, you can then install by booting flash drive. Install on flash drive is just a liveCD/flash which you should run in live mode, just to know it works with your system. Then you can install.
If you just want the default install of / (root) and swap it will auto install to the unallocated space.
But if you want more than the default you have to use Something Else and chose size of partition, format (ext4), mount (/, /home, etc). If dual booting with Windows a shared NTFS data partition is highly recommended.
[SOLVED] Can't install Windows 8 & Ubuntu in Toshiba Portege Z930 with explanation how by OP feb 2013
http://ubuntuforums.org/showthread.php?t=2114290
Some Toshiba's will not boot.
they managed to leave the signing key out of the database that's used to validate binaries
or make sure you have the most updated UEFI/BIOS.
Samsung, Lenovo & Toshiba UEFI issues
http://mjg59.dreamwidth.org/22028.html
Matthew Garrett's Blog
http://mjg59.dreamwidth.org/
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