In the interest of completeness, here is the output of inxi
root@r710:/# sudo inxi -Fmxx
System: Host: r710 Kernel: 5.13.0-52-generic x86_64 bits: 64 compiler: N/A Console: tty 3 wm: marco dm: LightDM
Distro: Ubuntu 20.04.5 LTS (Focal Fossa)
Machine: Type: Server System: Dell product: PowerEdge R710 v: N/A serial: DRV4TR1 Chassis: type: 23 serial: [redacted]
Mobo: Dell model: 00NH4P v: A12 serial: ..CN1374018500IQ. UEFI: Dell v: 6.6.0 date: 05/22/2018
Memory: RAM: total: 62.88 GiB used: 3.25 GiB (5.2%)
Array-1: capacity: 288 GiB slots: 18 EC: Multi-bit ECC max module size: 16 GiB note: est.
Device-1: DIMM_A1 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-2: DIMM_A2 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-3: DIMM_A3 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-4: DIMM_A4 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-5: DIMM_A5 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-6: DIMM_A6 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-7: DIMM_A7 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-8: DIMM_A8 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-9: DIMM_A9 size: No Module Installed
Device-10: DIMM_B1 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-11: DIMM_B2 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-12: DIMM_B3 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-13: DIMM_B4 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-14: DIMM_B5 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-15: DIMM_B6 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-16: DIMM_B7 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-17: DIMM_B8 size: 4 GiB speed: 1333 MT/s type: DDR3 manufacturer: 00CE00B380CE part-no: M393B5273CH0-YH9
Device-18: DIMM_B9 size: No Module Installed
CPU: Topology: 2x 6-Core model: Intel Xeon X5670 bits: 64 type: MT MCP SMP arch: Nehalem rev: 2 L1 cache: 384 KiB
L2 cache: 24.0 MiB L3 cache: 24.0 MiB
flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 140446
Speed: 1649 MHz min/max: 1596/2927 MHz Core speeds (MHz): 1: 1605 2: 1596 3: 1666 4: 1596 5: 1596 6: 1596 7: 1596
8: 1595 9: 1596 10: 1596 11: 1596 12: 1596 13: 1596 14: 1594 15: 1596 16: 1596 17: 1595 18: 1596 19: 1596 20: 1596
21: 1689 22: 1596 23: 1596 24: 1596
Graphics: Device-1: Matrox Systems MGA G200eW WPCM450 vendor: Dell PowerEdge R710 driver: mgag200 v: kernel bus ID: 08:03.0
chip ID: 102b:0532
Display: server: X.org 1.20.13 driver: modesetting unloaded: fbdev,vesa alternate: mga compositor: marco
tty: 133x43
Message: Advanced graphics data unavailable for root.
Audio: Message: No Device data found.
Network: Device-1: Broadcom and subsidiaries NetXtreme II BCM5709 Gigabit Ethernet vendor: Dell PowerEdge R710 driver: bnx2
v: kernel port: eca0 bus ID: 01:00.0 chip ID: 14e4:1639
IF: eno1 state: up speed: 1000 Mbps duplex: full mac: 78:2b:cb:53:7c:35
Device-2: Broadcom and subsidiaries NetXtreme II BCM5709 Gigabit Ethernet vendor: Dell PowerEdge R710 driver: bnx2
v: kernel port: eca0 bus ID: 01:00.1 chip ID: 14e4:1639
IF: eno2 state: down mac: 78:2b:cb:53:7c:37
Device-3: Broadcom and subsidiaries NetXtreme II BCM5709 Gigabit Ethernet vendor: Dell PowerEdge R710 driver: bnx2
v: kernel port: eca0 bus ID: 02:00.0 chip ID: 14e4:1639
IF: eno3 state: down mac: 78:2b:cb:53:7c:39
Device-4: Broadcom and subsidiaries NetXtreme II BCM5709 Gigabit Ethernet vendor: Dell PowerEdge R710 driver: bnx2
v: kernel port: eca0 bus ID: 02:00.1 chip ID: 14e4:1639
IF: eno4 state: down mac: 78:2b:cb:53:7c:3b
Drives: Local Storage: total: 10.92 TiB used: 6.16 TiB (56.4%)
ID-1: /dev/sda vendor: Dell PowerEdge RAID Card model: PERC H700 size: 10.91 TiB serial: N/A
ID-2: /dev/sdb type: USB vendor: Generic model: Flash Disk size: 7.71 GiB serial: AA515E5B
RAID: Hardware-1: Broadcom / LSI MegaRAID SAS 2108 [Liberator] driver: megaraid_sas v: 07.714.04.00-rc1 bus ID: 03:00.0
chip ID: 1000.0079
Partition: ID-1: / size: 10.83 TiB used: 6.16 TiB (56.9%) fs: ext4 dev: /dev/sda2
Sensors: Message: No ipmi sensors data was found.
System Temperatures: lm-sensors cpu: 29.0 C mobo: N/A
Fan Speeds (RPM): lm-sensors N/A
Info: Processes: 507 Uptime: 3h 42m Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.4.0 alt: 9 Shell: bash v: 5.0.17
running in: mate-terminal inxi: 3.0.38
All indications suggest a healthy system, yet I cannot boot into the system without using a bootable thumb drive (note the kernel I booted into: 5.13.0-52-generic; I have actually upgraded the kernel to 5.13.0-53-generic, which is approximately when I started having issues.