Ubuntu 15.10 not installable due missing characters

Solution 1:

First create the Ubuntu installation media properly with Disks in Ubuntu.
Open Disks - select Restore Disk Image from the menu on the top right.
Choose the ISO file and the USB drive to write it to and start restoring.
Alternatively you can burn the Ubuntu 15.10 ISO image to a DVD as well.

Boot from the Ubuntu 15.10 installation media you created before.
Highlight Try Ubuntu without installing and press the E key.
Add nouveau.modeset=0 to the end of the linux line.
Press the F10 key to boot into the Live desktop.

After the installation of Ubuntu 15.10 is finished reboot your computer.
Now install the latest official NVIDIA drivers supporting the GTX 750 Ti.

Highlight the Ubuntu menu entry and press the E key.
Add nouveau.modeset=0 to the end of the linux line.
Press the F10 key to boot the Ubuntu installation.

When the login screen appears, press Ctrl+Alt+F1.
Enter your user name and password and then execute :

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-358
sudo reboot