Strange behavior with re-installed laptop - URGENT

[MR ZenWiz]

On Thu, Jun 18, 2020 at 9:55 PM MR ZenWiz <mrzenwiz at gmail.com> wrote:
>
> My partner has a Dell Inspiron 3785 laptop as her main computer, with
> Windows 10 and Xubuntu 18.04.4 installed on it.  (It came with Win 10
> and I resized the C: partition so about 800Gb of the 1Tb disk is set
> aside for Xubuntu.)
>
It just got worse, and I think this may be the state it was in before
the reinstall.

The screen comes up in the Xubuntu boot with the following message:

[    1.826089] pci 0000:00:00.2: AMD-Vi: Unab;le to read/write to
IOMMU perf counter.
[    1.662557] tpm_crb MSFT0101:00: can't request region for resource [mem 0x4f7
/: recovering journal
/: clean, 199715/5120000files, 2388420/20479980 blocks
[    12.716718] pcieport 0000:00:01.7: AER: PCIeBus error:
severity=Corrected, type Data Link Layer, (Receiver ID)
[   12.716719] pcieport 0000:00:01.7: AER:   device [1022:15d3] error
status/mask=00000040/00006000
[   12.716721] pcieport 0000:00:01.7: AER:     [ 6] BadTLP
You are in emergency mode. After logging in, type "journalctl -xb" to view
system logs, "systemctl reboot" to reboot, "systemctl default" or "exit"
to boot into default mode.
Press Enter for maintenance
(or press Control-D to continue):

After this, nothing works.  I've tried looking at the system logs, but
I can't make head or tail of what it shows and I can't capture it to
post here.  The reboot option comes back to this same failure, and the
default option does the same.

Do I have to reinstall again or is there another way to recover from this?

Thanks.