Finally enabled bionic-proposed, and newest kernel 4.15.0-21-generic works again, so I guess it's fixed upstream. This is part of the update log for future reference:
root@ubuntu:/var/log/apt# apt dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages were automatically installed and are no longer required: linux-image-4.15.0-20-generic linux-modules-4.15.0-20-generic linux-modules-extra-4.15.0-20-generic Use 'apt autoremove' to remove them. The following NEW packages will be installed: linux-headers-4.15.0-21 linux-headers-4.15.0-21-generic linux-image-4.15.0-21-generic linux-modules-4.15.0-21-generic linux-modules-extra-4.15.0-21-generic The following packages will be upgraded: gnome-initial-setup gnome-session-bin gnome-session-common gnome-startup-applications ifupdown libgtop-2.0-11 libgtop2-common linux-generic linux-headers-generic linux-image-generic linux-libc-dev linux-signed-generic linux-signed-image-generic linux-source linux-source-4.15.0 netplan.io nplan python3-software-properties software-properties-common software-properties-gtk software-properties-kde ubuntu-session 22 upgraded, 5 newly installed, 0 to remove and 0 not upgraded. Need to get 197 MB of archives. After this operation, 335 MB of additional disk space will be used. Do you want to continue? [Y/n] ** Tags added: kernel-fixed-upstream ** Tags removed: kernel-da-key ** Tags added: kernel-da-key. ** Tags removed: kernel-da-key. ** Tags added: kernel-da-key -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1768647 Title: linux 4.15.0-20-generic messes up plymouth and no prompt for luks password Status in linux package in Ubuntu: Confirmed Bug description: With 4.15.0-19-generic everything works perfect. However, with 4.15.0-20-generic, when I power on the computer, the kde plymouth does not show the textbox to enter the root volume crypts luks password. The logo just stays there like in the attachment. If I uninstall plymouth and remove quiet and splash from GRUB_CMDLINE_LINUX_DEFAULT= && update-initramfs -u it boots in text- only mode and then can enter the password perfectly. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1768647/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
