[SOLVED] Dual-system boot broken by Win10 Update

noiett · 07-13-2017, 01:45 PM

Quote:

Originally Posted by Drakeo

Use the windows boot loader in windows 10 look at your boot options the windows boot loader will boot your other partitions. had to do that for a friend the other day. lets hope you used grub2 windows will boot it. you will have to find the correct F# to push at boot time. F9 or F10 or what ever you can go to bios and set to diagnostic start up and see the options at start. then you will use the windows uefi boot loader. it will look for your uefi on all partitions and slackware has one in boot. Select that system and boot. Wish you luck.
or use your slackware install disk and select the partition you want to boot.

Tried both things, neither of them worked. Booting the linux partition from the bios sends me to the same screen with the "error: unknown filesystem".
That's why I think there may be something wrong with the linux partition.

arubin · 07-13-2017, 02:28 PM

I have found rEFInd to be the most reliable boot manager and easiest to set up for me. I prefer to have the kernel in the EFI partition along with the boot manager.

In your situation I would boot up using a USB stick or simply the slackware installation DVD and mount the EFI partition. In my system I have a folder in the EFI partition called refind which has the refind efi file, refind.conf and the linux kernels.

colorpurple21859 · 07-13-2017, 03:14 PM

Run the following commands and see if that will get you a normal grub prompt
If hd0,5 doesn't work maybe try hd0,1

Code:

grub rescue> set prefix=(hd0,5)/boot/grub
grub rescue> set root=(hd0,5)
grub rescue> insmod normal
grub rescue> normal

noiett · 07-13-2017, 04:58 PM

Quote:

Originally Posted by colorpurple21859

Run the following commands and see if that will get you a normal grub prompt
If hd0,5 doesn't work maybe try hd0,1

Code:

grub rescue> set prefix=(hd0,5)/boot/grub
grub rescue> set root=(hd0,5)
grub rescue> insmod normal
grub rescue> normal

Finally! Typing these commands allowed me to see the GRUB screen again and boot my slackware installation.
After that I just needed to install GRUB again:

Quote:

grub-mkconfig -o /boot/grub/grub.cfg
grub-install /dev/sda

You just saved me from spending 2 days on setting up this laptop with all the tools, IDEs, servers, etc.

Thank you very much!!

RadicalDreamer · 07-13-2017, 05:40 PM

I'm glad you got it solved! I have no idea about Grub. My system it always showed the lilo prompt when booting from DVD. Perhaps it was reaching Grub instead of booting from the DVD and Grub is picking it up. You probably need to esc to bios and manually select the DVD or adjust the boot order in bios.

colorpurple21859 · 07-13-2017, 06:39 PM

your welcome