*** This bug is a duplicate of bug 1354730 ***
https://bugs.launchpad.net/bugs/1354730
** This bug has been marked a duplicate of bug 1354730
grub-install failed: Wrong number of args: mapdevfs with multi disk btrfs
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The issue is with an update to grub-efi-amd64-signed see if you can
install without internet connection
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https://bugs.launchpad.net/bugs/1785491
Title:
Ubiquity crash during install
I see now the issue was with grub-installer.
For what it's worth, I might suggest reaching out to the elementary OS
team for their resolution to this issue. I've not had any issues on the
same hardware installing any version of elementary OS with grub + btrfs,
even on versions based on previous
