* Ubuntu 18.04 & 19.04 keep freezing due to video driver issues *

Until about a month ago, I had been running Ubuntu 18.04 successfully on my Dell Latitude (7th Gen Intel i7 processor, Kaby Lake, and Intel HD 620 GPU).

However, after a recent update to 18.04, I am experiencing constant freezes, after ive been logged in for 2 to 5 minutes.

I tried reinstalling 18.04, and upgrading to 19.04, neither solved the problem.

I know that the issue is related to my video drivers, because if I edit the grub to 'nomodeset', the machine will boot and run (but obviously with very poor video performance).

Ive tried installing the ppa open graphics drivers /oibaf drivers, but that doesnt work either. After installing, I check my drivers to ensure that the box for the oibaf drivers is checked (within 'other software' in the drivers app), and restart... and inevitably when I restart, the system is still using the i915 drivers.

(I run 'lshw -c video' within terminal to see which video driver is being used, and my system seems to still be using the i915 driver, which is causing the crashes)

Is there anything else I need to do to force Ubuntu to use the PPA drivers?

Hoping one of you fine people can help me out here?

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