Thanks @tyhicks.
$ dmesg | grep microcode [ 0.000000] microcode: microcode updated early to revision 0x1f, date = 2018-02-07 [ 0.843339] microcode: sig=0x306a9, pf=0x2, revision=0x1f [ 0.843412] microcode: Microcode Update Driver: v2.2. $ cat /proc/version_signature Ubuntu 4.13.0-38.43+lp1759920.1-generic 4.13.16 $ cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-4.13.0-38-generic root=/dev/mapper/lmvg-ubunturoot ro zswap.enabled=0 quiet
Thanks @tyhicks.
$ dmesg | grep microcode signature 38.43+lp1759920 .1-generic 4.13.16 /boot/vmlinuz- 4.13.0- 38-generic root=/dev/ mapper/ lmvg-ubunturoot ro zswap.enabled=0 quiet
[ 0.000000] microcode: microcode updated early to revision 0x1f, date = 2018-02-07
[ 0.843339] microcode: sig=0x306a9, pf=0x2, revision=0x1f
[ 0.843412] microcode: Microcode Update Driver: v2.2.
$ cat /proc/version_
Ubuntu 4.13.0-
$ cat /proc/cmdline
BOOT_IMAGE=