Comment 114 for bug 1759920

This is *not* fixed for Xenial. I had originally applied the workaround in the bug description to get my computer to boot again. After seeing a "fixed" status for this bug, I updated intel-microcode. After I rebooted, my computer would not boot to the kernel which had the microcode applied (4.4.0-122). It would only boot to the previous kernel without the microcode (4.4.0-119).

$ tail -n 5 /var/log/apt/history.log
Start-Date: 2018-05-05 06:06:43
Commandline: apt install intel-microcode
Upgrade: intel-microcode:amd64 (3.20180108.0+really20170707ubuntu16.04.1, 3.20180312.0~ubuntu16.04.1)
End-Date: 2018-05-05 06:06:57

$ uname -a
Linux thinkpad 4.4.0-119-generic #143-Ubuntu SMP Mon Apr 2 16:08:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

$ dpkg -l | grep linux-image-4 | grep ^i
ii linux-image-4.4.0-112-generic 4.4.0-112.135 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
ii linux-image-4.4.0-119-generic 4.4.0-119.143 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
ii linux-image-4.4.0-122-generic 4.4.0-122.146 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial

$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 58
model name : Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz
stepping : 9
microcode : 0x1c
cpu MHz : 893.761
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm epb retpoline kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts
bugs : cpu_meltdown spectre_v1 spectre_v2
bogomips : 3391.94
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management: