Looking at this again, it appears the low resolution is caused by the
kernel option 'nomodeset':

[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-34-generic
root=UUID=cff0943b-896f-4480-a885-69bef7b3e8cd ro quiet splash nomodeset
vt.handoff=1

You need to remove 'nomodeset' from your kernel command line. You will
likely then need the fix or workaround for bug 1727356 too.


** Changed in: ubuntu
       Status: Expired => Invalid

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https://bugs.launchpad.net/bugs/1793428

Title:
  Video after upgrading is only 1024x768

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