Comment 96 for bug 1759920

HWE Kernel in xenial-testing resolves the issue as well

/proc/version_signature
Ubuntu 4.13.0-39.44~16.04.1-generic 4.13.16
/proc/cmdline
BOOT_IMAGE=/@/boot/vmlinuz-4.13.0-39-generic root=UUID=7dcb6f6f-1069-4315-a421-0d60fffecef9 ro rootflags=subvol=@
dmesg -t | grep -i microcode
microcode: microcode updated early to revision 0x2d, date = 2018-02-07
microcode: sig=0x206a7, pf=0x2, revision=0x2d
microcode: Microcode Update Driver: v2.2.