Remove 2.8 and dual boot 3.4 with Ubuntu

[gold_finger]

That's strange -- don't know why it would be showing LL as 2.8 still.  When you installed LL3.4 did you remember to check the box to format the root partition (/dev/sda3) that you installed to?  If not, do the installation again and format the partition.


Otherwise, ...


Boot into Ubuntu, open a terminal and post back here with output from following commands.  (See this post for instructions on how to post terminal output to forum using code blocks.)

Code:

sudo os-prober
cat /boot/grub/grub.cfg | grep "menuentry '"

(NOTE:  "menuentry '" part of command is typed as double-quote, menuentry, space, single-quote, double-quote.)


Now, going to have you mount the LL root partition in terminal, run a command to confirm the version installed, then unmount it.  Post back with output of these commands also:

Code:

sudo mount /dev/sda3 /mnt
cat /mnt/etc/issue
sudo umount /dev/sda3

P.s.
I edited your prior posts with terminal output to put them in code blocks.  For some reason (unknown to me) lines with the "@" character between "Ray" and "Ray-Kudu-Pro" seem to automatically trigger the forum software to convert the line into something referring to a member with username "Ray".  Just ignore that -- it's a glitch in forum software design ... a very annoying glitch (to me at least).