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I have a system with dual boot (debian 8/ windows 8)
After i formatted a drive from windows 8 i'm unable to boot even from usb, always it says 'Unknown Filesystem'.

Now, I can only boot the linux by using grub commands like

set boot=(hd0,msdos1)
set prefix=(hd0,msdos1)/boot/grub
insmod normal
normal

I've tried to format the drives after booting the debian 8, this way. But, still i can't get into the system without grub commands.



Now how can i boot from usb & install a new OS removing all the partitions ?

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2 Answers 2

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After you successfully boot your debian, correct the grub configuration and install new grub. I have never used debian but I believe it is similar to Ubuntu, so sudo grub-install would probably be the right command, after you change the grub config files. Maybe take a look here Windows 10 upgrade led to grub rescue where is says how you correct Ubuntu grub configuration.

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Your OS is Debian, not Ubuntu. Should ask your question here

OR ask your question on IRC: irc.debian.org on channel #debian

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