I just upgraded from Ubuntu 18.04 to Ubuntu 18.10 on a Windows 10 dual boot machine. The machine has a Nvidia GeForce GTX 1080 GPU. I have tried to diagnose and fix the problem using prior posted solutions, such as video card issues with nomodeset(https://askubuntu.com/questions/162075/my-computer-boots-to-a-black-screen-what-options-do-i-have-to-fix-it and https://askubuntu.com/questions/1087559/cant-boot-ubuntu-properly-after-dual-boot-installation-with-windows-10) but this did not work, and the boot script no longer contains "quiet splash" anyways. Also in the boot script I set acpi = off but then I get another error, perhaps for another thread (PKCS#7 signature not signed with a trusted key), and the boot instead crashes on this error.
In recovery mode (4.18.0-10-generic) I tried running fsck but could not unmount the partition. I am using 97% of my bootloader partition so I ran recovery mode's clean but that also did not fix the issue.
I am not sure what else I should try - I anxiously await and appreciate any further guidance you may have.
Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https:/
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