Fastboot flash bootloader fails I tried to install CM11 on my Nexus 10. But, I wasn't able to install the boot.img with fastboot (Rooted, CM11 flashed with Clockworkmod recovery):

[root@xx temp]# fastboot flash bootloader boot.img
sending 'bootloader' (5100 KB)...
OKAY [  0.708s]
writing 'bootloader'...
FAILED (remote: partition table update fail!)
finished. total time: 0.726s
[root@xx temp]#

The boot.img is from cm-11-20140405-SNAPSHOT-M5-manta.zip.

Any ideas, why this doesn't work?
The partition you want to write to is called boot, not bootloader, so the correct command is

fastboot flash boot boot.img