Xubuntu 26.04 LTS Boot Issue Fix (iMac 21" mid 2011) This fixes an issue where the computer freezes during boot at the command line (TTY1) due to timing issues between the Radeon HD 6500/6600/6700M graphics card and the display manager.
1. Configure the GRUB Bootloader Open the GRUB configuration file: sudo nano /etc/default/grub Copy the following lines into the file: GRUB_DEFAULT=0 GRUB_TIMEOUT_STYLE=hidden GRUB_TIMEOUT=0 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Ubuntu` GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=1 radeon.runpm=0 amdgpu.modeset=0" GRUB_CMDLINE_LINUX="" Save and close the file. Update the GRUB configuration: sudo update-grub Install or restore the GRUB bootloader to the disk: sudo grub-install 2. LightDM Display Manager Fix Force the login screen to wait until the graphics card drivers have definitely loaded. Open the LightDM configuration file: sudo nano /etc/lightdm/lightdm.conf Add the following line under the [Seat:*] section: logind-check-graphical=true Save and close the file. 3. Forcing the Radeon Driver into Early Boot (Dracut) Force the Radeon driver to load at the very beginning of the boot process. Create and open a new configuration file: sudo nano /etc/dracut.conf.d/radeon.conf Copy the following line into the file: force_drivers+=" radeon " Save and close the file. Update the initial ramdisk files for all kernels: sudo dracut -f --regenerate-all 4. Reboot Restart the computer: sudo reboot -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2152557 Title: Xubuntu 26.04 LTS boot issue To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/2152557/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
