[server] caot boot fresh installed ubuntu server 16.04

I installed ubuntu server 16.04 from a USB stick. At the step of installing GRUB boot loader. I can choose which disk I want to install it.

/dev/sda, is the usb drive.
/dev/sdb, is the hard drive i installed ubuntu. I chose this one.

after installation completed. I removed usb. Now there are 2 options in the boot menu.

first one is Toshiba which is the hard drive I installed ubuntu server. If I use this option to boot, I will get the following error.
"This is a NAS data disk and can not boot system. System halted"

Another option is "ubuntu". if I use this one to boot . It will take me to a screen below. I dont know what to do with it.