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Re: Possibly erroneous "device not present" message during boot




On 04/12/2017 07:39 AM, songbird wrote:
Richard Owlett wrote:

...
THE SYMPTOM:

When I got home and booted to the SD card I noticed a message appeared
for ~10 seconds reporting that a device was not found giving the UUID of
the SD card.

I verified the UUID by checking the fstab file and by using gparted.

THE QUESTION:

Do I have an actual problem?
What should I be checking?

 - the bios may not be set correctly to find the device.

I do not see how the bios might be involved.
Grub2 has been installed to the MBR of /dev/sda .
The only known reference to Grub2 is in the instance of Debian residing on /dev/sda1 .
Whether initiated after power-on OR a restart the observed sequence is:
1. Appearance of the Grub2 menu with a choice of 4 instances of Debian.
2. Select instance installed on the SD card.
3. Screen clears, this message appears against the Debian 8 background.
   error:  no such device: 380e2a6d-f851-4fd1-9db2-869a0982b511.
   Press any key to continue ...
4. Otherwise the instance of Debian on the SD card boots routinely.


 - you may have changed it but not saved it (ditto
on the partition table).

What may may I have changed and not saved.
The *ONLY* time anything has been to/with/??? the partition &/or partition was when the Debian Installer created the single partition as a "Primary partition" and formatted it as ext4.


 - you may have the root/boot partitions in
fstab wrong (i never use UUIDs but make partition
labels instead and use those).

"fstab" was created by the installer using its defaults.
I agree that UUIDs make no sense for a application such as mine.
I haven't got around to changing things - TODO is lengthening.


 - error in preseed file which put something in
a different location than intended.

No preseed file has been involved. The installation was completely manual in Expert Mode.


 - grub may not have done what you expected.

As likely as moon being "green cheese"? <grin>
I've not had a grub problem since first using it on Squeeze, although I've often doubted the sanity of some design choices.
Besides a few thousand people use it daily without problems ;/

In theory, I know of the existence of log files. I've never had reason to investigate them. Which should I preserve, if any?



  songbird