Boot failure with "sparse file not allowed" and "grub_is_shim_lock_enabled" / boot hangs at "three dots" stage

Please provide system information.

System Information

Output of this command (formatted according to forum requirements) may be useful for those wishing to help:

inxi --filter --verbosity=8

or the short form:

inxi -zv8

Be prepared to provide more information and outputs from other commands whenever asked. It’s equally important to provide as much actionable information as possible in your first post, rather than simply indicating there is a problem.


This might be related; particularly if you’re using Nvidia graphics. While it’s unclear whether this will solve your particular issue, it may go some way toward addressing a possible contributor;

Relevance: Testing and Stable branches.

Please see the Stable Update 2025-03-24 announcement, under Known Issues and Solutions; specifically, the item System may hang during splash screen when Nvidia 570 drivers are used:

See the linked item for a workaround.

Regards.