I'm asking this because initially, my problem was this (power failure during installation,

so I typed the following instructions in the maintenance shell:

sudo mount -o remount,rw /
 sudo dpkg --configure a
 sudo mount -o remount,ro /
 sudo sync
 sudo reboot 

The first three lines worked, afterwards, my computer (a Dell Inspiron 530) got stalled for several hours, so I unplugged it. When I turned it on, the log in screen appeared, and after I try to write my password, it leads me back to the log screen. I must note that when I typed the first three lines during the maintenance shell mode, it said that the errors which were encountered during processing were:

initscripts
bluez
gnome-bluetooth

So, what do I have to do in order to get back to the maintenance shell so I can type code again?

And, what code do I have to write in order to restore my computer?

Thank you for your attention.