Hi, I have followed your suggestion and recorded the output of `journalctl -b-1` to the files appended.
`prevboot1.text` is with `GRUB_CMDLINE_LINUX_DEFAULT="nouveau.noaccel=1 quiet splash"` and `prevboot2.txt` is with `GRUB_CMDLINE_LINUX_DEFAULT="nomodeset quiet splash"` in `/etc/default/grub`, which both fail to boot (or is X not loaded properly?). BTW I have found that my Ubuntu starts properly if I boot it with the entry in `Advanced Options` in BIOS and choose it there; only using the Ubuntu entry first displayed when BIOS pops up gets stucked in black/purple screen. Best Alexander ** Attachment added: "prevboot" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1904474/+attachment/5435256/+files/prevboot -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1904474 Title: Black/purple screen after booting Ubuntu Status in gnome-shell package in Ubuntu: Incomplete Bug description: Hi, I am failing to boot into a freshly installed Ubuntu 18.04.5 LTS on my ThinkPad-T460. When choosing the right bootloader in BIOS I get a dark screen, Ubuntu is not booting (also after 15mins of waiting ...). I first thought my issue would be a *Black/purple screen after you boot Ubuntu for the first time* like over here: https://askubuntu.com/questions/162075/my-computer-boots-to-a-black- screen-what-options-do-i-have-to-fix-it So I added ```ǹomodeset``` in the script executed before booting Ubuntu. Interestingly I was able to boot and then made this change persistent by updating the bootloader. I tried some more times to boot and suddenly it stopped working properly (with same blackscreen as before). I also took a look to the bootscript, ```ǹomodeset``` was present there. Then I played around with some other obscure suggestions like adding ```nouveau.noaccel=1``` instead of ```nomodeset``` and replace ```qiuiet splash``` by ```noapic noacpi nosplash inqpoll```, but nothing gave me a soultion which did not get stuck with black screen of death after some reboots. I am a little bit clueless at the moment, so I have appended the uncompressed logs in ```/var/log```, captured like in https://wiki.ubuntu.com/DebuggingKernelBoot . The files appended are from a boot that got stuck, I have killed my laptop after 10mins of nothing happening. Btw. I have a dual boot with Windows 10, but I do not know if this is relevant for this issue. Best Alexander --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.20 Architecture: amd64 CurrentDesktop: ubuntu:GNOME DisplayManager: gdm3 DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2020-11-16 (1 days ago) InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1) Package: gnome-shell 3.28.4-0ubuntu18.04.3 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 5.4.0-53.59~18.04.1-generic 5.4.65 Tags: bionic Uname: Linux 5.4.0-53-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1904474/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp