** Changed in: grub-efi-amd64-signed (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1829331
Title:
Grub regexp command does not work in secure boot mode
T
Thank you very much. I confirmed it's working on Ubuntu 20.04, and the
grub is 2.04-1ubuntu26.
Steven
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https://bugs.launchpad.net/bugs/1829331
Title:
Grub regexp command does not work
Hi,
Try use the newest version.
Secure Boot forbids loading any external modules thus command "regexp"
on Ubuntu 19.04 does not work in the secure boot mode, but it works in
the non-secure boot mode.
regexp is in grub efi image (debian/build-efi-images).
https://git.launchpad.net/ubuntu/+source
OK, for ubuntu-19.04-live-server-amd64.iso booting in secure boot mode, I found
more commands are not working, at least including:
lspci
probe
md5sum
play
sha1sum
tr
usb
videoinfo
While the following are working:
ls
cat
echo
help
reboot
I am wondering is this due to some purpose about security?
I repeated the above steps for ubuntu-18.04.2-live-server-amd64.iso, and
got the same result. The regexp command in the grub shell does not work
in secure boot mode. However, it does work in non-secure boot mode.
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** Attachment added: "Grub command regexp works in the non-secure boot mode"
https://bugs.launchpad.net/ubuntu/+source/grub-efi-amd64-signed/+bug/1829331/+attachment/5264191/+files/grub-working.png
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