How to enable AVX2 on Ubuntu 20.04

I'm trying to get AVX2 enabled on a machine with Ubuntu 20.04.

I've run these commands to install AVX2:

Update the package index:
# sudo apt-get update
Install libmkl-avx2 deb package:
# sudo apt-get install libmkl-avx2

as per:

The processor is:

processor : 0
vendor_id : AuthenticAMD
cpu family : 21
model : 2
model name : AMD FX-8320E Eight-Core Processor
stepping : 0
microcode : 0x6000852
cpu MHz : 2036.567
cache size : 2048 KB
physical id : 0
siblings : 8
core id : 0
cpu cores : 4
apicid : 16
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 mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc>
bugs : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass
bogomips : 6422.00
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro

but when checking for avx in cpuinfo I only see avx, not avx2:

grep avx /proc/cpuinfo
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb cpb hw_pstate ssbd ibpb vmmcall bmi1 arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold

What am I doing wrong? Do I need to enable AVX2 somehow?

In case anybody's wondering if I'm asking how to install AVX2. I'm not. They're already installed. Just not available/recognized by the cpu for some reason. see below:

root@home:~$ sudo apt-get install libmkl-dev libmkl-avx2
Reading package lists... Done
Building dependency tree
Reading state information... Done
libmkl-avx2 is already the newest version (2020.0.166-1).
libmkl-dev is already the newest version (2020.0.166-1).
0 upgraded, 0 newly installed, 0 to remove and 141 not upgraded.

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