With a specific (msdos) fdisk arrangement utilizing LVM and with /boot not mounted installing grub results in lvm warnings and then blocks the next startup.

Steps to reproduce

1) Build a disk according to the output of fdisk /dev/sda, lvm info and /etc/fstab

2) run boot-update which produces this boot.conf

3) manually unmount /dev/sda1 (/boot)

4) run grub installation /usr/sbin/grub-install --target=i386-pc --no-floppy /dev/sda

The output I get is

Installing for i386-pc platform.

  /run/lvm/lvmetad.socket: connect failed: No such file or directory

  WARNING: Failed to connect to lvmetad. Falling back to internal scanning.

  /run/lvm/lvmetad.socket: connect failed: No such file or directory

  WARNING: Failed to connect to lvmetad. Falling back to internal scanning.

  /run/lvm/lvmetad.socket: connect failed: No such file or directory

  WARNING: Failed to connect to lvmetad. Falling back to internal scanning.

Installation finished. No error reported.

While it claims no error, grub will not find grub.cfg at startup.