I am a complete novice so please don't give a highly technical answer.
I tried to install 14.04.1 LTS on my laptop. I used Windows 7 as OS. I tried to install the option Ubuntu alongside Windows
. I did not install Ubuntu on my laptop's hard drive but on an external 1TB hard drive.
The installation completed successfully and message came that I must restart the machine to be able to use Ubuntu.
At first the machine did not turn off. It said something like
"Could not acquire the 'org.freedesktop.ModemManager' service name'.
It just froze on that black screen and I physically had to reboot again.
Then when it started up, it got to a screen which said:
error:no such device: b788941c-14b1-41c8- . . Other numbers. . . . Entering rescue mode . . . Grub rescue . . .
It seems that is waiting for an instruction
What should I do? I was hoping to be able to use any of the two systems Windows or Ubuntu depending on choice, but now I can't even log on to my old Windows system!!
Please help.