network IO issue with Ubuntu 20.04 on RPI4

[Colin Law]

On Sat, 3 Jul 2021 at 16:30, R C <cjvijf at gmail.com> wrote:
>
> /var/log/syslog.1:Jul  2 09:47:50 seismo kernel: [67573.340483] blk_update_request: I/O error, dev sda, sector 60088192 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0

Errors like that almost certainly mean you have a hardware problem.
If it isn't the card itself  then something on-board, or possibly the
power supply.