I recently dual booted my laptop with Ubuntu and Windows 10. Initially, it used to show recovering journal on booting up. Then I used nouveau.modeset=0 and logged in and installed Nvidia driver 390. While doing so it asked me for a MOK key to enter after reboot but failed to do so. Now, there isn't that black screen with recovering journal. But, after I enter my login details, the purple screen remains. The login is working only when I am disabling the secure boot. But, I don't want to disable secure boot. Please help.

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