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Description
Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is.
For UEFI systems, GRUB can be shown by holding the ESC key at startup, while the update manager's kernel warning screen only shows SHIFT, which works for BIOS systems. This can create confusion when users are trying to recover their operating system.
Describe the solution you'd like
A clear and concise description of what you want to happen.
Add "or ESC" or something similar to the warning screen.
Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
Additional context
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