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[SOLVED] Boot Error: File system mounted not a valid /
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vifia
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Joined: 20 Jul 2004
Posts: 15

PostPosted: Sat Jan 30, 2016 3:39 pm    Post subject: [SOLVED] Boot Error: File system mounted not a valid / Reply with quote

Hello everyone . . . I cant seem to find a working solution for this error that appeared at boot after updating a perfectly running system:
Code:
 The file system mounted does not appear to be a valid /

I ended up just backing up all my configs and reinstalling with a fresh stage 3, thinking it was time to start from fresh. Received the same error after I exited the live cd and rebooted.

Fstab:
Code:
/dev/sdb6      /boot        ext2      defaults    0 2
/dev/sdb7      none         swap      sw           0 0
/dev/sdb8      /            ext4      noatime      0 1
/dev/cdrom     /mnt/cdrom   auto      noauto,ro   0 0
/dev/sda1      /mnt/win_c   ntfs-3g   defaults     0 0      
/dev/sdb1      /mnt/win_d   ntfs-3g   defaults,ro    0 0

Below is a screenshot of the boot screen.
[img=http://s12.postimg.org/imfsrc6fd/Gentoo_Boot_Error.jpg]
Please let me know if anything else would be helpful.
Thanks for your time!

V.


Last edited by vifia on Sat Jan 30, 2016 10:04 pm; edited 1 time in total
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Irre
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Joined: 09 Nov 2013
Posts: 340
Location: Stockholm

PostPosted: Sat Jan 30, 2016 8:25 pm    Post subject: Reply with quote

Did you
Code:
fsck /dev/sdb8
?
Are usb dev and ext4 supported in kernel

I often have to reenter /dev/sdxx when booting from external device via grub. Boot loader "lilo" works fine for me.
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 43186
Location: 56N 3W

PostPosted: Sat Jan 30, 2016 9:20 pm    Post subject: Reply with quote

vifia,

The important line in your image is
Code:
!! Could not find the root block device in .

Its important for what it does not say.

After the word "in" the kernel has listed all the block devices it can see. In this case none at all.

Please don't reinstall - it won't fix anything and just offers the opportunity to make different mistakes.
Discovering and fixing your issue is a learning opportunity.

Your kernel and/or initrd is missing some code needed be able to find your HDD at all.

We need to see your lspci output, your bootloader .cfg file and your kernel .config file.
The kernel .config will not fit into a post. Use wgetpaste to put it onto a pastebin site and tell us the link.

We also need to know how you configured and built your kernel.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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NeddySeagoon
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Location: 56N 3W

PostPosted: Sat Jan 30, 2016 9:23 pm    Post subject: Reply with quote

Irre,

You need rootdelay=7 or rootwait on the kernel command line.

Your problem is that the kernel normally mounts root before it starts USB. Thats a problem if root is on USB.
rootwait will wait forever for root to become available. rootdelay=7 waits 7 seconds. Feel free to change the 7.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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vifia
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Joined: 20 Jul 2004
Posts: 15

PostPosted: Sat Jan 30, 2016 10:03 pm    Post subject: Reply with quote

Thanks everyone for replying.

This issue is resolved. Somehow I restored an old grub2 config file (etc/default/grub); one that I used to use when I was running systemd. I changed to openrc a few weeks ago, didn't disable the systemd settings and haven't had a need to generate a new grub.cfg until now.

Many thanks for your efforts again!

-V.
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