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initramfs error when trying to reboot to newly installed Ubuntu 22.04

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I got an initramfs error when trying to reboot to newly installed Ubuntu 22.04.

enter image description here
ACPI BIOS error

enter image description here ALERT!  /dev/sda2 does not exist. Dropping to a shell!

in flag
Looks like you installed Ubuntu on a removable disk, then removed that disk. Either way, there is an insufficient amount of actionable information here to work with. Could you [edit] the question to include the exact steps you followed, including which devices were connected and disconnected during the process?
karel avatar
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@matigo In the 2nd screenshot I can see `/dev/sda1` but `/dev/sda2` is nowhere to be found (or possibly removed). This happens occasionally and a canonical duplicate question for this situation exists, but meanwhile this question is unclear.
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