loading previous version of kernel

Colin Law clanlaw at gmail.com
Thu Oct 22 21:29:52 UTC 2015


On 22 October 2015 at 22:07, Gary J. Kirkpatrick <garyartista at gmail.com> wrote:
>
>
> On Thu, Oct 22, 2015 at 11:02 PM, Colin Law <clanlaw at gmail.com> wrote:
>>
>> On 22 October 2015 at 18:43, Gary J. Kirkpatrick <garyartista at gmail.com>
>> wrote:
>> > Sometimes my touchscreen does not work and a few other issues, so I
>> > thought
>> > I'd load up an earlier kernel.  Ubuntu 14 is my only operating system so
>> > you
>> > should be able to choose other kernels (I have at least 1 other
>> > installed)
>> > by holding the shift key down.  Nada.
>> >
>> >
>> > http://askubuntu.com/questions/87409/i-cant-get-grub-menu-to-show-up-during-boot
>> >
>> > There are some remedies here.  I wonder if anyone here has a suggestion.
>>
>> So which of those have you tried?  In particular what have you got in
>> /etc/default/grub.  Maybe copy/paste it here.
>
>
> Not tried any, looking for advice first.

OK, I assumed that you had looked there and done a bit of googling to
see what it all means but could not get it to work.  See [1] for a
description of what the settings do

I think that if you change
GRUB_HIDDEN_TIMEOUT=0
to
GRUB_HIDDEN_TIMEOUT=

Then it should show the boot menu for 10 seconds (as you have
GRUB_TIMEOUT  set to that).

I say 'think' because actually I just have that line commented out,
but I see from the wiki page that the recommended suggestion is to set
it to blank.

Don't forget to run
sudo update-grub
after saving the file.

[1]  https://help.ubuntu.com/community/Grub2/Setup#Configuring_GRUB_2

Colin

>
> # If you change this file, run 'update-grub' afterwards to update
> # /boot/grub/grub.cfg.
> # For full documentation of the options in this file, see:
> #   info -f grub -n 'Simple configuration'
>
> GRUB_DEFAULT=0
> GRUB_HIDDEN_TIMEOUT=0
> GRUB_HIDDEN_TIMEOUT_QUIET=true
> GRUB_TIMEOUT=10
> GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
> GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
> GRUB_CMDLINE_LINUX=""
>
> # Uncomment to enable BadRAM filtering, modify to suit your needs
> # This works with Linux (no patch required) and with any kernel that obtains
> # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
> #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
>
> # Uncomment to disable graphical terminal (grub-pc only)
> #GRUB_TERMINAL=console
>
> # The resolution used on graphical terminal
> # note that you can use only modes which your graphic card supports via VBE
> # you can see them in real GRUB with the command `vbeinfo'
> #GRUB_GFXMODE=640x480
>
> # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to
> Linux
> #GRUB_DISABLE_LINUX_UUID=true
>
> # Uncomment to disable generation of recovery mode menu entries
> #GRUB_DISABLE_RECOVERY="true"
>
> # Uncomment to get a beep at grub start
> #GRUB_INIT_TUNE="480 440 1"
>
> garyk
>
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