[Ubuntu Wiki] Update of "DebuggingKernelBoot" by penalvch

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The "DebuggingKernelBoot" page has been changed by penalvch:
http://wiki.ubuntu.com/DebuggingKernelBoot?action=diff&rev1=23&rev2=24

Comment:
Add caveat for 18.04 as GRUB verbage different.

  quiet
  splash
  vt.handoff=7}}}
-  1. On the line that contains: {{{
+  1.
+   a. If using Ubuntu 18.04, on the line that contains: {{{
+ gfxmode $linux_gfx_mode
+ }}}modify it to: {{{
+ gfxmode text}}}
+   a. If using an older version of Ubuntu, on the line that contains: {{{
  gfxpayload=$linux_gfx_mode}}}modify it to: {{{
  gfxpayload=text}}}
   1. Press 'Ctrl+x' to boot.