I also had faced same issue in xubuntu 20.04 installation.
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https://bugs.launchpad.net/bugs/1872212
Title:
grub-install: Operation not permitted
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Public bug reported:
Received below error at the end of ubuntu budgie 20.04 installation
Which I was doing from usb bootable
with Lenovo Z50-70 and UFI mode.
Error:
Executing 'grub-install /dev/sda' failed. T
This is fatal error.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20
Public bug reported:
package linux-image-4.15.0-36-generic 4.15.0-36.39~16.04.1 failed to
install/upgrade: subprocess installed pre-removal script returned error
exit status 1
ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-36-generic 4.15.0-36.39~16.04.1
ProcVersionS
