To install nvidia 375 on Ubuntu 14.04.5 makes tty7 has black screen

[Taihsiang Ho]

Dell Vostro 5560 (CID 201303-13111) with GPU Intel - 8086:0166, nVidia - 10de:1140
Ubuntu 14.04.5

[Steps To Reproduce]
1. Install Ubuntu 14.04.5 over live USB. Do not update the system during the installation (Don't click "Downloading updates" in Ubiquity prompt.)
2. When the desktop is ready, issue "sudo apt-get update && sudo apt-get install nvidia-375" to install the nvidia 375 driver in the ubuntu archive.
3. Reboot after the installation.

[Expected Result]
Get into X session of the system desktop.

[Actual Result]
Black screen. However, some of the other tty (tty1~tty6) are available.

[More Information]
1. The black screen tty7 could be available again by updating the system again ("sudo apt-get update && sudo apt-get dist-upgrade -y")
2. If updating the system during the system installation, this issue is still reproducible. And tty7 could be back by the above bullet 1 method.
3. This issue could be reproduced on another laptop Dell Vostro 5468 (CID 201606-22342, GPU Intel - 8086:5916, nVidia - 10de:134d), and get back tty7 by the same way.

[Taihsiang Ho (tai271828)]

Log collected right after the system was installed.

[Taihsiang Ho (tai271828)]

Log collected right after installing nvidia 375, rebooting and getting the black screen.

[Taihsiang Ho (tai271828)]

Log collected right after updating system again following the nvidia 375 installation.

This log was collected right after issuing "sudo apt-get update && sudo apt-get dist-upgrade -y" without rebooting the system, and the tty7 is back before the reboot.

Use glxgears to test the resumed tty7, and the FPS is around 8400. X session looks good now.

[Alberto Milone (albertomilone)]

This means that the problem is already in the archive, and installing the new driver is not the actual issue. Is this correct?

[Taihsiang Ho (tai271828)]

@Alberto, yes.