It could be many things. What error was displayed prior to being dropped into the recovery shell?

This is a normal error message to see when working with your system's primary disk. By default, the kernel reads the primary disk's partition table at boot, so the error is telling you that the kernel won't reflect the change you just made using your partitioning utility. You can also verify this by looking at the contents of /proc/partitions (the partitions currently recognized by the kernel). The solution is to use the command: partprobe This command will signal the kernel to re-read the disk's partition tables and after you run it, you should see the change reflected in /proc/partitions as well (so you know the kernel has the most recent partition table loaded).

@@scottmcbrien6535 Will it effect lvms which are available in volume group vg1.

@@ImranKhan-zu6qv This is a hard question to answer exactly because I don't know the setup of your machine. If sdx1 was not a member of any volume groups, it should not affect your LVM setup. If sdx1 was part of a volume group, or even created as a physical volume, you'll want to pvremove it prior to deleting the partition. If you already deleted the partition, use fdisk (or whatever partitioning utility you perfer) and add the partition back. pvremove it, then remove the partition.