I have installed Ubuntu 16.04.03 from a DVD via a USB CD/DVD drive onto my Toshiba Satellite U920T laptop, erasing the Windows 8 that was on there. The installation went fine and as requested I removed the DVD at the end of the process.
However, when the computer restarts the following message comes up
Insert system disk in drive.
Press any key when ready..
I have looked in the Bios and the computer is set to start on the SSD/HDD. Putting the DVD back into the DVD drive allows me to repeat the installation process, which I have done with the same result. Pressing F12 while starting the computer and selecting the SSD/HDD brings me back to the Insert system...
message.
The boot log is at http://paste.ubuntu.com/25748557/ This is the log after creating the NTFS partition suggested below and reinstalling Ubuntu.
I would be grateful for any help.