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Problem of dual-boot lubuntu 16.04 with gentoo
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kenmux
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PostPosted: Fri Dec 23, 2016 3:08 am    Post subject: Problem of dual-boot lubuntu 16.04 with gentoo Reply with quote

Hi all,

These days I ran into an issue related with dual-boot lubuntu with gentoo.

I have 5 partitions:/dev/sda1~/dev/sda5:

Code:
Partition   Description
/dev/sda1   BIOS boot partition
/dev/sda2   Boot partition
/dev/sda3   Swap partition
/dev/sda4   Root partition
/dev/sda5   Lubuntu 16.4


At the very beginning, I first installed gentoo, then lubuntu 16.04.
The grub config was overwritten by lubuntu, all ran well.
I only assigned /dev/sda5 for lubuntu root, so gentoo shared swap with it.
One more info is that, I used openrc for gentoo, but lubuntu used systemd?

One day, I reinstalled gentoo, and the grub was overwritten by it.
Then, I could not boot lubuntu any more.
Of course, I emerged os-loader with grub2.
The lubuntu just complain that:

Code:
Welcome to emergency mode! After logging in, type "journalctl -xb" to view
system logs, "systemctl reboot" to reboot, "systemctl default" or ^D to
try again to boot into default mode.
Press Enter for maintenance   
(or press Control-D to continue):


I tried using fsck but with no luck. Then what the hell goes wrong?
Any ideas? Please give me a hand! Thanks a lot.


Last edited by kenmux on Mon Dec 26, 2016 1:59 am; edited 2 times in total
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tshade
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PostPosted: Fri Dec 23, 2016 4:11 pm    Post subject: Reply with quote

Try editing grub.conf manually. You should add the needed lines to boot lubuntu (the problem here is: which options?). Or you can use SuperGrubDisk, maybe, but I can't promise it will work.
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kenmux
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PostPosted: Sun Dec 25, 2016 8:21 am    Post subject: Reply with quote

tshade wrote:
Try editing grub.conf manually. You should add the needed lines to boot lubuntu (the problem here is: which options?). Or you can use SuperGrubDisk, maybe, but I can't promise it will work.

Any guide? The grub.cfg became hard to read in grub2 you know.
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Jaglover
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PostPosted: Sun Dec 25, 2016 2:28 pm    Post subject: Reply with quote

Quote:
One day, I reinstalled gentoo, and the grub was overwritten by it.

Why? If you already had Grub installed by Lubuntu, why didn't you use it?

Surprisingly, Grub has manual: https://www.gnu.org/software/grub/manual/grub.html#Configuration
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Roman_Gruber
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PostPosted: Sun Dec 25, 2016 7:19 pm    Post subject: Reply with quote

easiest way is to hack the binary distro bootloader
and do not forget to make a backup of your grub.cfg

known issue that a second os overwrites the parts responsibile for booting

regardless if its spyware 10, noobuntu, nooblinuxmint or whateverit is

...

those opreating systems are made for newbies or guys with just one operating system
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kenmux
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PostPosted: Mon Dec 26, 2016 1:58 am    Post subject: Reply with quote

Jaglover wrote:
Why? If you already had Grub installed by Lubuntu, why didn't you use it?


Because, I thought the grub gui from gentoo looks much better than the one from ubuntu.
One more thing is that, ubuntu always put itself on the first place, and I'd prefer gentoo.
So, I reinstalled the grub with the fresh gentoo. The grub recognized ubuntu and did menu entries for it.
But, these entries could not boot ubuntu at all!

Roman_Gruber wrote:
known issue that a second os overwrites the parts responsibile for booting

Yes, from now on, I knew, ubuntu does something else, make it hard to boot from os-loader.
Very annoying, isn't it? Ubuntu, why you do the things different from others, just like Windows?
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Roman_Gruber
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PostPosted: Thu Dec 29, 2016 7:13 pm    Post subject: Reply with quote

kenmux wrote:
Jaglover wrote:
Why? If you already had Grub installed by Lubuntu, why didn't you use it?


Because, I thought the grub gui from gentoo looks much better than the one from ubuntu.
One more thing is that, ubuntu always put itself on the first place, and I'd prefer gentoo.
So, I reinstalled the grub with the fresh gentoo. The grub recognized ubuntu and did menu entries for it.
But, these entries could not boot ubuntu at all!

Roman_Gruber wrote:
known issue that a second os overwrites the parts responsibile for booting

Yes, from now on, I knew, ubuntu does something else, make it hard to boot from os-loader.
Very annoying, isn't it? Ubuntu, why you do the things different from others, just like Windows?


Don *t worry, windows will also destroy your "boot" section without asking.
Microsoft made it that way, that the bios self searches for windows and activates it. too bad i have not really figured out how to abuse the uefi bios doing the same for my grub bootloader

when i swap in my windows hDD. it instantly is recognized and set up.

when you swap out your grub hdd, you have to reinitalize the UEFI bootloader maping.

--

Microsoft just has the money to dictate how things have to be. and they made it for the uefi bootloader for example.

--

And Windows works, well thats up to discussions.

I want to say something what i heard recently. Something may be the best for myself, but does not mean its the best for everyone
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