How to handle a dual-boot system after recompiling a kernel?
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I have a dual-boot system, on /dev/sdb4 I have Gentoo, and on /dev/sdb5 I installed Ubuntu 18.04 afterwards. My boot partition is /dev/sdb2, and I let Ubuntu handle the whole bootloader stuff. And that worked well, Ubuntu found my Gentoo installation, added it to Grub, and I was able to boot into both operating systems.
Now I updated the Kernel within Gentoo, recompiled it and emerge --depcleaned, so the old Kernel is gone now. Didn't think much about it.
But now I can't boot into Gentoo anymore. There's still a Grub entry for it, but it doesn't work, so Grub boots into Ubuntu nonetheless. I've tried sudo grub-install /dev/sdb again, and also update-grub from within Ubuntu. It still says that it finds the Gentoo installation, and there is still a Grub entry for it, but it is not bootable.
I have mounted both Gentoo's and Ubuntu's /boot directory to /dev/sdb2, but let Ubuntu clean it in its own installation, so I fear that Gentoo's /boot directory points to the partition that Ubuntu has erased and created anew.
I'm still on a BIOS-system, by the way. No UEFI yet.
How can I repair this mess without having to go through reinstalling kind of everything?
ubuntu boot grub gentoo
edited Mar 9 at 9:26
Rui F Ribeiro
41.9k1483142
asked Mar 9 at 8:51
Sonderoffizier GuckSonderoffizier Guck
1
add a comment |
I have a dual-boot system, on /dev/sdb4 I have Gentoo, and on /dev/sdb5 I installed Ubuntu 18.04 afterwards. My boot partition is /dev/sdb2, and I let Ubuntu handle the whole bootloader stuff. And that worked well, Ubuntu found my Gentoo installation, added it to Grub, and I was able to boot into both operating systems.
Now I updated the Kernel within Gentoo, recompiled it and emerge --depcleaned, so the old Kernel is gone now. Didn't think much about it.
But now I can't boot into Gentoo anymore. There's still a Grub entry for it, but it doesn't work, so Grub boots into Ubuntu nonetheless. I've tried sudo grub-install /dev/sdb again, and also update-grub from within Ubuntu. It still says that it finds the Gentoo installation, and there is still a Grub entry for it, but it is not bootable.
I have mounted both Gentoo's and Ubuntu's /boot directory to /dev/sdb2, but let Ubuntu clean it in its own installation, so I fear that Gentoo's /boot directory points to the partition that Ubuntu has erased and created anew.
I'm still on a BIOS-system, by the way. No UEFI yet.
How can I repair this mess without having to go through reinstalling kind of everything?
ubuntu boot grub gentoo
edited Mar 9 at 9:26
Rui F Ribeiro
41.9k1483142
asked Mar 9 at 8:51
Sonderoffizier GuckSonderoffizier Guck
1
For start show us the content ofgrub.cfg.fstabcan be helpful too. gentoo doesn't delete old kernel withemerge --depcleaan, just removes its sources. If you compiled new kernel then most probably all all you need to do is copy new image to/boot/and update grub config. You can do all these stuff from within ubuntu.
– jimmij
Mar 9 at 9:26
@jimmij: Thank you very much. Indeed I just had to domake installon the gentoo kernel to get it to the/bootpartition and thengrub-mkconfigin Ubuntu. However, I had to delete thegrub.cfgfile before asgrub-mkconfigdoesn't seem to overwrite it, if present. Now I have a functional dual-boot system again. Thank you. :)
– Sonderoffizier Guck
Mar 10 at 8:42
add a comment |
I have a dual-boot system, on /dev/sdb4 I have Gentoo, and on /dev/sdb5 I installed Ubuntu 18.04 afterwards. My boot partition is /dev/sdb2, and I let Ubuntu handle the whole bootloader stuff. And that worked well, Ubuntu found my Gentoo installation, added it to Grub, and I was able to boot into both operating systems.
Now I updated the Kernel within Gentoo, recompiled it and emerge --depcleaned, so the old Kernel is gone now. Didn't think much about it.
But now I can't boot into Gentoo anymore. There's still a Grub entry for it, but it doesn't work, so Grub boots into Ubuntu nonetheless. I've tried sudo grub-install /dev/sdb again, and also update-grub from within Ubuntu. It still says that it finds the Gentoo installation, and there is still a Grub entry for it, but it is not bootable.
I have mounted both Gentoo's and Ubuntu's /boot directory to /dev/sdb2, but let Ubuntu clean it in its own installation, so I fear that Gentoo's /boot directory points to the partition that Ubuntu has erased and created anew.
I'm still on a BIOS-system, by the way. No UEFI yet.
How can I repair this mess without having to go through reinstalling kind of everything?
ubuntu boot grub gentoo
edited Mar 9 at 9:26
Rui F Ribeiro
41.9k1483142
asked Mar 9 at 8:51
Sonderoffizier GuckSonderoffizier Guck
1
I have a dual-boot system, on /dev/sdb4 I have Gentoo, and on /dev/sdb5 I installed Ubuntu 18.04 afterwards. My boot partition is /dev/sdb2, and I let Ubuntu handle the whole bootloader stuff. And that worked well, Ubuntu found my Gentoo installation, added it to Grub, and I was able to boot into both operating systems.
Now I updated the Kernel within Gentoo, recompiled it and emerge --depcleaned, so the old Kernel is gone now. Didn't think much about it.
But now I can't boot into Gentoo anymore. There's still a Grub entry for it, but it doesn't work, so Grub boots into Ubuntu nonetheless. I've tried sudo grub-install /dev/sdb again, and also update-grub from within Ubuntu. It still says that it finds the Gentoo installation, and there is still a Grub entry for it, but it is not bootable.
I have mounted both Gentoo's and Ubuntu's /boot directory to /dev/sdb2, but let Ubuntu clean it in its own installation, so I fear that Gentoo's /boot directory points to the partition that Ubuntu has erased and created anew.
I'm still on a BIOS-system, by the way. No UEFI yet.
How can I repair this mess without having to go through reinstalling kind of everything?
ubuntu boot grub gentoo
ubuntu boot grub gentoo
edited Mar 9 at 9:26
Rui F Ribeiro
41.9k1483142
asked Mar 9 at 8:51
Sonderoffizier GuckSonderoffizier Guck
1
edited Mar 9 at 9:26
Rui F Ribeiro
41.9k1483142
asked Mar 9 at 8:51
Sonderoffizier GuckSonderoffizier Guck
1
edited Mar 9 at 9:26
Rui F Ribeiro
41.9k1483142
edited Mar 9 at 9:26
Rui F Ribeiro
41.9k1483142
edited Mar 9 at 9:26
Rui F Ribeiro
41.9k1483142
41.9k1483142
asked Mar 9 at 8:51
Sonderoffizier GuckSonderoffizier Guck
1
asked Mar 9 at 8:51
Sonderoffizier GuckSonderoffizier Guck
1
asked Mar 9 at 8:51
Sonderoffizier GuckSonderoffizier Guck
1
1
For start show us the content ofgrub.cfg.fstabcan be helpful too. gentoo doesn't delete old kernel withemerge --depcleaan, just removes its sources. If you compiled new kernel then most probably all all you need to do is copy new image to/boot/and update grub config. You can do all these stuff from within ubuntu.
– jimmij
Mar 9 at 9:26
@jimmij: Thank you very much. Indeed I just had to domake installon the gentoo kernel to get it to the/bootpartition and thengrub-mkconfigin Ubuntu. However, I had to delete thegrub.cfgfile before asgrub-mkconfigdoesn't seem to overwrite it, if present. Now I have a functional dual-boot system again. Thank you. :)
– Sonderoffizier Guck
Mar 10 at 8:42
add a comment |
For start show us the content ofgrub.cfg.fstabcan be helpful too. gentoo doesn't delete old kernel withemerge --depcleaan, just removes its sources. If you compiled new kernel then most probably all all you need to do is copy new image to/boot/and update grub config. You can do all these stuff from within ubuntu.
– jimmij
Mar 9 at 9:26
@jimmij: Thank you very much. Indeed I just had to domake installon the gentoo kernel to get it to the/bootpartition and thengrub-mkconfigin Ubuntu. However, I had to delete thegrub.cfgfile before asgrub-mkconfigdoesn't seem to overwrite it, if present. Now I have a functional dual-boot system again. Thank you. :)
– Sonderoffizier Guck
Mar 10 at 8:42
For start show us the content of
grub.cfg. fstab can be helpful too. gentoo doesn't delete old kernel with emerge --depcleaan, just removes its sources. If you compiled new kernel then most probably all all you need to do is copy new image to /boot/ and update grub config. You can do all these stuff from within ubuntu.– jimmij
Mar 9 at 9:26
For start show us the content of
grub.cfg. fstab can be helpful too. gentoo doesn't delete old kernel with emerge --depcleaan, just removes its sources. If you compiled new kernel then most probably all all you need to do is copy new image to /boot/ and update grub config. You can do all these stuff from within ubuntu.– jimmij
Mar 9 at 9:26
@jimmij: Thank you very much. Indeed I just had to do
make install on the gentoo kernel to get it to the /boot partition and then grub-mkconfig in Ubuntu. However, I had to delete the grub.cfg file before as grub-mkconfig doesn't seem to overwrite it, if present. Now I have a functional dual-boot system again. Thank you. :)– Sonderoffizier Guck
Mar 10 at 8:42
@jimmij: Thank you very much. Indeed I just had to do
make install on the gentoo kernel to get it to the /boot partition and then grub-mkconfig in Ubuntu. However, I had to delete the grub.cfg file before as grub-mkconfig doesn't seem to overwrite it, if present. Now I have a functional dual-boot system again. Thank you. :)– Sonderoffizier Guck
Mar 10 at 8:42
add a comment |
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For start show us the content of
grub.cfg.fstabcan be helpful too. gentoo doesn't delete old kernel withemerge --depcleaan, just removes its sources. If you compiled new kernel then most probably all all you need to do is copy new image to/boot/and update grub config. You can do all these stuff from within ubuntu.– jimmij
Mar 9 at 9:26
@jimmij: Thank you very much. Indeed I just had to do
make installon the gentoo kernel to get it to the/bootpartition and thengrub-mkconfigin Ubuntu. However, I had to delete thegrub.cfgfile before asgrub-mkconfigdoesn't seem to overwrite it, if present. Now I have a functional dual-boot system again. Thank you. :)– Sonderoffizier Guck
Mar 10 at 8:42