It happened to one of mys systems this morning. The system never got past the 
logo for the motherboard manufacturer (AsRock). Here is the top part of dmesg 
down to where the failure message occurred, [code]    
0.000000] kernel: Linux version 5.4.0-21-generic (buildd@lcy01-amd64-006) (gcc 
version 9.3.0 (Ubuntu 9.3.0-8ubuntu1)) #25-Ubuntu SMP Sat Mar 28 13:10:28 UTC 
2020 (Ubuntu 5.4.0-21.25-generic 5.4.27)
[    0.000000] kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic 
root=/dev/mapper/vgxubuntu-root ro text
[    0.000000] kernel: KERNEL supported cpus:
[    0.000000] kernel:   Intel GenuineIntel
[    0.000000] kernel:   AMD AuthenticAMD
[    0.000000] kernel:   Hygon HygonGenuine
[    0.000000] kernel:   Centaur CentaurHauls
[    0.000000] kernel:   zhaoxin   Shanghai  
[    0.000000] kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating 
point registers'
[    0.000000] kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[    0.000000] kernel: x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[    0.000000] kernel: x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
[    0.000000] kernel: x86/fpu: Enabled xstate features 0x7, context size is 
832 bytes, using 'compacted' format.
[    0.000000] kernel: BIOS-provided physical RAM map:
[    0.000000] kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009d3ff] 
usable
[    0.000000] kernel: BIOS-e820: [mem 0x000000000009d400-0x000000000009ffff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x0000000000100000-0x0000000009d01fff] 
usable
[    0.000000] kernel: BIOS-e820: [mem 0x0000000009d02000-0x0000000009ffffff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x000000000a000000-0x000000000a1fffff] 
usable
[    0.000000] kernel: BIOS-e820: [mem 0x000000000a200000-0x000000000a20afff] 
ACPI NVS
[    0.000000] kernel: BIOS-e820: [mem 0x000000000a20b000-0x000000000affffff] 
usable
[    0.000000] kernel: BIOS-e820: [mem 0x000000000b000000-0x000000000b01ffff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x000000000b020000-0x00000000daaf5fff] 
usable
[    0.000000] kernel: BIOS-e820: [mem 0x00000000daaf6000-0x00000000dbfe7fff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x00000000dbfe8000-0x00000000dc169fff] 
usable
[    0.000000] kernel: BIOS-e820: [mem 0x00000000dc16a000-0x00000000dc57dfff] 
ACPI NVS
[    0.000000] kernel: BIOS-e820: [mem 0x00000000dc57e000-0x00000000dd0c5fff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x00000000dd0c6000-0x00000000deffffff] 
usable
[    0.000000] kernel: BIOS-e820: [mem 0x00000000df000000-0x00000000dfffffff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x00000000fd000000-0x00000000ffffffff] 
reserved
[    0.000000] kernel: BIOS-e820: [mem 0x0000000100000000-0x000000041f37ffff] 
usable
[    0.000000] kernel: NX (Execute Disable) protection: active
[    0.000000] kernel: SMBIOS 3.2.1 present.
[    0.000000] kernel: DMI: To Be Filled By O.E.M. To Be Filled By 
O.E.M./B450M/ac, BIOS P1.50 10/14/2019
[    0.000000] kernel: tsc: Fast TSC calibration failed
[/code]

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https://bugs.launchpad.net/bugs/1804591

Title:
  tsc: Fast TSC calibration failed

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