This is identified as a proper "typo" bug in grub, fixing.
** Description changed:
+ [Impact]
+ Dual-boot installs of Ubuntu and Windows 10, and other instances of
chainloading another bootloader from grub2.
+
+ [Test cases]
+ 1) Install Windows 10
+ 2) Install Ubuntu in a dual-boot setup with the existing Windows 10 install.
(resize or install on a second disk)
+ 3) Boot to the "ubuntu" entry in UEFI firmware.
+ 4) Hold Shift to get the grub menu
+ 5) Pick "Windows 10" at the grub menu
+
+ Verify that the Windows 10 entry from grub menu correctly boots to
+ Windows 10. Without the patch, there should be a "relocation failed"
+ error message. With the patch, Windows 10 should start normally.
+
+ [Regression potential]
+ Regressions would show up as other cases of failure to load the bootloader
that is being chainloaded to -- it is not noticeably different than the current
failure more (which is also a failure to load the bootloader). Chainload is
otherwise unlikely to affect the started loader.
+
+ ---
+
package: shim-signed, shim
release: Ubuntu 18.04.1 LTS
version: shim-signed:amd64 1.37~18.04.1+15+1533136590.3beb971-0ubuntu1
- shim:amd64 15+1533136590.3beb971-0ubuntu1
+ shim:amd64 15+1533136590.3beb971-0ubuntu1
expected: grub menu loading xubuntu and windows in dualboot
happened: loading xubuntu works, loading windows failes (no error - black
screen - no hard disc light flashing)
- I uninstalled shim, shim-signed, disabled 'bionic-updates' and installed old
versions
+ I uninstalled shim, shim-signed, disabled 'bionic-updates' and installed old
versions
shim-signed:amd64 1.34.9.2+13-0ubuntu2
shim:amd64 13-0ubuntu2
and boot works well like before.
I enabled 'bionic-updates' and installed the newer versions without
error and again chainloading of windows fails.
** Changed in: shim-signed (Ubuntu)
Status: Triaged => Invalid
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https://bugs.launchpad.net/bugs/1792564
Title:
new version of shim refuses to chainload windows in dualboot
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