http://askubuntu.com/questions/468466/why-this-occurs-error-diskfilter-writes-are-not-supported " It's a BUG! This is a bug that occurs in the most recent version of Ubuntu Server (Ubuntu Server 14.04 LTS), when you create the boot partition (or the root partition, when the boot partition doesn't exists) inside a LVM or a RAID partition. You can get more info about this bug in Ubuntu Launchpad: Bug #1274320 "Error: diskfilter writes are not supported" . Why does this bug occur? When the system is booting, GRUB reads ( load_env ) data in /boot/grub/grubenv . This file is called GRUB Environment Block . From the GRUB Manual: It is often useful to be able to remember a small amount of information from one boot to the next. [...] At boot time, the load_env command (see load_env) loads environment variables from it, and the save_env (see save_env) command saves environment variables to it. ...
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