Ubuntu 10.04 uses logical volume management to manage storage devices, or volumes, such as hard disk drives and partitions. LVM assigns a metadata header to the beginning of each physical volume, which contains the layout of all volumes in a group. After configuring LVM, an error such as "Unknown LVM Metadata Header" may appear when running certain commands or when booting the OS.
Launch Terminal and sign in as root:
Press "Enter" to run the command.
Run the following command to unmount the boot partition:
Use the "pvremove" command to wipe the label from the device:
Replace "<drive>" with the name of the affected device (e.g. /dev/sda1).
Run "blkid <drive>" without quotes to find the universally unique identifier for the partition. Run "gedit /etc/fstab" -- again without quotes -- to open the file systems table in a text editor.
Look up the UUID in the file. Change the mount point to "/boot" and then save the file.
Close gedit. Remount the partition using the following command to fix the unknown LVM metadata header in Ubuntu 10.04: