GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" , the changing thereof

[rowan]

Changing
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
To
GRUB_CMDLINE_LINUX_DEFAULT=

then running sudo ` update-grub " works well on a HDD installed , ubuntu say ,giving the traditional
rolling messages.

When I do the same on a live edition using persistence on a USB stick , update-grub gives

` /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?). ".

Could someone kindly give me some guidance , please ?

[oshunluvr]

Re: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" , the changing thereof

sounds like grub isn't finding the root install. What's the output of mount

[rowan]

Re: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" , the changing thereof

Oshunluvr, thanks for your reply.

/etc/fstab contains :

ufs / aufs rw 0 0
tmpfs /tmp tmpfs nosuid,nodev 0 0
/dev/sda5 swap swap defaults 0 0
~
/etc/mtab contains :

aufs / aufs rw 0 0
none /proc proc rw,noexec,nosuid,nodev 0 0
none /sys sysfs rw,noexec,nosuid,nodev 0 0
none /dev devtmpfs rw,mode=0755 0 0
none /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0
/dev/sdb2 /cdrom vfat rw,relatime,fmask=0022,dmask=0022,codepage=cp437,i ocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0
/dev/loop0 /rofs squashfs ro,noatime 0 0
none /sys/fs/fuse/connections fusectl rw 0 0
none /sys/kernel/debug debugfs rw 0 0
none /sys/kernel/security securityfs rw 0 0
none /dev/shm tmpfs rw,nosuid,nodev 0 0
tmpfs /tmp tmpfs rw,nosuid,nodev 0 0
none /var/run tmpfs rw,nosuid,mode=0755 0 0
none /var/lock tmpfs rw,noexec,nosuid,nodev 0 0
none /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0
gvfs-fuse-daemon /home/ubuntu/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=ubuntu 0 0
/dev/sdb1 /media/UB10-4~3SP vfat rw,nosuid,nodev,uhelper=udisks,uid=999,gid=999,sho rtname=mixed,dmask=0077,utf8=1,flush 0 0
~
I tried sudo su mount -l root and got

mount: can't find root in /etc/fstab or /etc/mtab .

The real puzzle is that everything went fine with installed to HDD drive version .

On the HDD version ` /boot/grub/grub.cfg " EXISTS .
On the live version `/boot/grub/grub.cfg " DOESN'T EXIST instead there is `/boot/grub/grubenv " .
Therein lies the problem .

[oshunluvr]

Re: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" , the changing thereof

This is kind of a left field operation - updating GRUB on a liveUSB using persistence.

I suspect the OS in in a packaged compressed file so the normal paths for GRUB don't work because they aren't there. This isn't may area of knowledge. Hopefully, someone will join the thread that does

[dibl]

Re: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" , the changing thereof

Right -- the fact that /boot/grub/grub.cfg does not exist is your clue that editing /etc/default/grub (even if if you could find it) would be fruitless. You've got an AUFS compressed filesystem installation in which update-grub does not function to build /boot/grub/grub.cfg in the "normal", i.e. standard filesystem fashion.

The only way you could have a user-controlled grub menu on a USB stick is if you install Linux as though the USB stick were an hdd, which of course entails making a partition with ext2, -3, or -4 filesystem, and then installing on that, or some similar technique such as this.

[rowan]

Re: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" , the changing thereof

Many thanks oshunluvr and dibl for your replies .

Dibl, as for installing on the USB as though it were a normal install would defeat the object ,

as I already have it on the HDD.

What about putting the iso image in `ISOMASTER", extracting Casper ,finding the /etc/default/grub ,

removing "quiet splash" , and re-inserting casper , of course I would have to unpack and pack the

initrd.lz file,where , I suspect the grub file is ?

[dibl]

Re: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" , the changing thereof

I'm very doubtful that the file /etc/default/grub even exists on that ISO image. Are you able to examine or edit the file /boot/grub/grubenv?