Focal:

root@ip-172-31-24-163:~# dmesg | grep console
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.4.0-1024-aws 
root=PARTUUID=a2f52878-01 ro console=tty1 console=ttyS0 
nvme_core.io_timeout=4294967295 panic=-1
[    2.184073] ACPI: SPCR: console: uart,mmio,0xc5a00000,115200
[    2.189603] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.4.0-1024-aws 
root=PARTUUID=a2f52878-01 ro console=tty1 console=ttyS0 
nvme_core.io_timeout=4294967295 panic=-1
[    3.954119] printk: console [tty1] enabled
[    4.022533] printk: console [ttyS0] enabled
[    4.968930] printk: console [ttyS0] disabled
[    5.910255] printk: console [ttyS0] enabled

Groovy:

root@ip-172-31-20-184:~# dmesg | grep console
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.8.0-1004-aws 
root=PARTUUID=654e5f57-01 ro console=tty1 console=ttyS0 
nvme_core.io_timeout=4294967295 panic=-1
[    1.440395] ACPI: SPCR: console: uart,mmio,0xc5a00000,115200
[    1.445875] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.8.0-1004-aws 
root=PARTUUID=654e5f57-01 ro console=tty1 console=ttyS0 
nvme_core.io_timeout=4294967295 panic=-1
[    3.207680] printk: console [tty1] enabled
[    3.277829] printk: console [ttyS0] enabled
[    3.561696] fbcon: Taking over console

Note that Groovy has:

[    3.561696] fbcon: Taking over console

Maybe in newer kernels /dev/console is taken over by a broken
framebuffer console?

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https://bugs.launchpad.net/bugs/1473527

Title:
  module ssh-authkey-fingerprints fails Input/output error: /dev/console

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