So, when the system is working fine, before the freeze, can you SSH into
it?

Also, what is the kernel version running in the Live image you're booting 
there? This information shows early in the kernel logs...but you can also 
collect using the "uname -a" command. I'd like to compare the version of the 
booting USB stick versus the regular version showing issues.
Thanks in advance,

Guilherme

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https://bugs.launchpad.net/bugs/1917194

Title:
  [Dell G5 5590] lspci freezes computer on Ubuntu 20.04

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After upgrading from Ubuntu 18.04 to 20.04 my computer started to
  freeze when running lspci.

  I ended up noticing that it happened when trying to query device
  '1f:00.0' a USB port. After some kernel and bios updates the problem
  got worse. Now the computer freezes ~5 seconds after booting up.

  I tried:
  1) Running in recovery mode, also freezes
  2) Running an older kernel version (5.4.0-66-generic), also freezes
  3) Removing nvidia drivers (just in case), also freezes
  4) Running all combinations nodemodeset, acpi=off an nouveau blacklisting
  5) Updating all drivers

  The computer freezes for ever, I can't switch TTYs, move the mouse,
  anything, the only way to leave was to force shutdown. On the last
  cases after switching to a tty I could see this messages before the
  freeze ocurred:

  kernel: xhci_hcd 0000:1f:00.0: PCI post-resume error -19!
  kernel: xhci_hcd 0000:1f:00.0: HC died; cleaning up

  Running Ubuntu 20.04 from a USB sticks works fine, as well as doing a fresh 
install.
  All logs were obtained by chrooting to the faulty partition from a fresh 
install, if there are any more logs that would be helpful, let me know.

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