[Ubuntu Wiki] Update of "DebuggingKernelBoot" by penalvch

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Mon Feb 5 16:49:49 UTC 2018


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The "DebuggingKernelBoot" page has been changed by penalvch:
http://wiki.ubuntu.com/DebuggingKernelBoot?action=diff&rev1=18&rev2=19

Comment:
Due to LP#1746357 provide clarity on when initramfs applies for debugging.

  
  Depending on the type of error messages you encounter, there are other boot options you could try. For example, if you notice ACPI errors, try booting with the '''acpi=off''' boot option. For a full description of these options, refer to the [[https://www.kernel.org/doc/html/v4.14/admin-guide/kernel-parameters.html|kernel parameters]] document.
  
- = Initramfs =
+ = Dropped into a initramfs shell =
  
- Sometimes you may even be dropped into an initramfs shell. This indicates errors in the boot sequence, for example failing to find your root partition/filesystem. You are put into the initramfs shell in an effort to allow you to recover the system. Hopefully, if you boot with the '''quiet''' and '''splash''' options removed you will notice error messages before being dropped into the shell which will help debug and direct you to a solution.
+ If your boot is dropped into an initramfs shell, this indicates errors in the boot sequence, for example failing to find your root partition/filesystem. You are put into the initramfs shell in an effort to allow you to recover the system. Hopefully, if you boot with the '''quiet''' and '''splash''' options removed you will notice error messages before being dropped into the shell which will help debug and direct you to a solution.
  
  If you are dropped into an initramfs shell you may want to also try booting with the '''debug''' boot option.  It should write a log to /tmp/initramfs.debug. You could also specify some arbitrary argument (for example '''debug=vc''') to have the output written to the console.
  



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