The root cause of this is discussed at bug #1565950.
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https://bugs.launchpad.net/bugs/1762988
Title:
Bootloader installation fails on UEFI systems with FDE (incl. /boot)
To manage
This also affects the 18.04.1 "alterantive installer (debian-installer),
where I reproduced it today.
This error will not occur on the current default server installer
(Subiquity) at this time since it does not support dmcrypt-luks at all.
To my knowledge, the desktop installer (Ubiquity) does
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubiquity (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1762988
Title:
** Summary changed:
- Ubiquity crashes at the bootloader installation phase
+ Bootloader installation fails on UEFI systems with FDE (incl. /boot)
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