I wasn't able to reproduce the problem on Trusty, even with sssd installed.
/proc/version_signature Ubuntu 4.4.0-119.143~14.04.1-generic 4.4.114
/proc/cmdline BOOT_IMAGE=/boot/vmlinuz-4.4.0-119-generic root=UUID=e57a614e-ad1a-449e-954d-ce832d128920 ro quiet splash vt.handoff=7
dmesg -t | grep -i microcode (with CPUs other than 0 removed) microcode: CPU0 microcode updated early to revision 0x2d, date = 2018-02-07 microcode: CPU0 sig=0x206a7, pf=0x2, revision=0x2d microcode: Microcode Update Driver: v2.01 <email address hidden>, Peter Oruba
I wasn't able to reproduce the problem on Trusty, even with sssd installed.
/proc/version_ signature 143~14. 04.1-generic 4.4.114
Ubuntu 4.4.0-119.
/proc/cmdline /boot/vmlinuz- 4.4.0-119- generic root=UUID= e57a614e- ad1a-449e- 954d-ce832d1289 20 ro quiet splash vt.handoff=7
BOOT_IMAGE=
dmesg -t | grep -i microcode (with CPUs other than 0 removed)
microcode: CPU0 microcode updated early to revision 0x2d, date = 2018-02-07
microcode: CPU0 sig=0x206a7, pf=0x2, revision=0x2d
microcode: Microcode Update Driver: v2.01 <email address hidden>, Peter Oruba