UNetbootin won't install on Trisquel 7

To solve the problem of being able to boot just when the USB device is
present, and so be able to boot without it, follow this instructions:

1. Boot THE LIVE SYSTEM that's inside the USB device.

2. Use either a file manager like Nautilus, or the commands to mount the
partition where YOUR INSTALLED SYSTEM is. If you choose Nautilus, find
it below "Devices" and simply click on it. If you choose to use
commands, you can use Blkid in conjunction with Lsblk and GNU Df to aid
you on locating the correct partition to mount (partition's block
devices have numbers at the end, and have disk drive's block devices as
their parents, for example: "sda1" or "hda1". Note that we don't want
"hda" or "sda" for now, although we will be looking for them shortly
after this step), then use:

sudo mount [Put the path of the block device of THE PARTITION here]
"/mnt"

To mount the partition's block device at "/mnt".

2. Use Lsblk to list block devices (disk drives and partitions) and
their mount points, hierarchically.

3. From here, choose the DISK DRIVE's block device in which you want to
install GRUB, and then take note of it. It's common practice to choose
the one which is the parent of your INSTALLED SYSTEM.

Note: Steps 4 through were taken from: http://superuser.com/a/111215

4. Mount the proc file system being used:

sudo mount --types "proc" "/proc" "/mnt/proc"

5. Mount the sys file system:

sudo mount --types "sysfs" "/sys" "/mnt/sys"

6. Mount the "/dev" as "/mnt/dev" using the "bind" option (I can't be
more helpful here, as the info page for mount shows nothing about this
option):

sudo mount --options "bind" "/dev" "/mnt/dev"

Note: This guide assumes that there is "/boot" directory inside the
INSTALLED SYSTEM, that is: GRUB will look for files thre, and there is
no need to mount any other partition. This note also applies to other
directories such as "/usr" and "/var", except "/home".

Note: We won't be using network connections inside the INSTALLED SYSTEM
just for now.

7. Change the current terminal's root to "/mnt" and use "/bin/bash" as
our shell:

sudo chroot "/mnt" "/bin/bash"

8. Use GNU Grep to print the file "/proc/mounts", except the lines with
"rootfs", and put the result at "/etc/mtab" so that GRUB can see which
mount points exist:

grep --invert-match "rootfs" "/proc/mounts" > "/etc/mtab"

8. Install GRUB on THE DISK DRIVE's block device, and tells GRUB to use
the "/boot" directory from THE INSTALLED SYSTEM PARTITION's block device
(the --boot-directory option is absent), and recheck the device map
(just in case), :

grub-install --recheck [Place the absolute/full path of THE DISK DRIVE's
block device here]

For example, if you want to install GRUB in "/dev/sda":

grub-install --recheck "/dev/sda"

9. Update GRUB:

update-grub

10. Our work is done here, let's exit and clear the mess. Leave the
INSTALLED SYSTEM's partition:

exit

11. Use umount to unmount the mount points previously done, like:

sudo umount "/mnt/proc"
sudo umount "/mnt/sys"
sudo umount "/mnt/dev"
sudo umount "/mnt/usr"
sudo umount "/mnt/var"

12. Use umount to unmount the INSTALLED SYSTEM's partition:

sudo umount "/mnt"

13. Reboot to THE INSTALLED SYSTEM.

Respectfully, Adonay.
Have a nice day.

--
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Why are you even using UNetbootin? It has the potential to create all sorts of
mystifying problems with the boot process, even long into the actual existence
of the installation.

Just prepare a boot USB with dd from the official Trisquel netinst/ Trisquel
standard image, as per the instructions on the wiki or here:
https://wiki.debian.org/BootUsb. It should work fine- although the GRUB
installation problem never seems to go away when using installing from USB
using a Debian-based installer. Just have a live CD handy to correct things- if
things go wrong you can always just chroot in to resolve the issue (Lucky I had
that Fedora CD lying around).