I installed Ubuntu 15.04 and then upgraded to Ubuntu 15.10 on my laptop (Fujitsu U745). My touchpad works in Windows but never worked in both versions of Ubuntu.
It shows up in xinput list command
xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ETPS/2 Elantech Touchpad id=13 [slave pointer (2)]
⎜ ↳ Logitech Gaming Mouse G502 id=10 [slave pointer (2)]
⎜ ↳ Logitech Gaming Mouse G502 id=11 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Fujitsu FUJ02E3 id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Power Button id=8 [slave keyboard (3)]
↳ FJ Camera id=9 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=12 [slave keyboard (3)]
But in dconf-editor it isn't even listed
Looking around the web rather lead me to nowhere without this listed. Also the mousepad doesn't even work on login screen too and I have checked the Fn-F4 mouse lock.
Update
The Terminal result from the wordpress
leo@LIFEBOOK-U745:~/Desktop$ sudo dkms install -m psmouse -v elantech-x551c
Kernel preparation unnecessary for this kernel. Skipping...
Building module:
cleaning build area....
make KERNELRELEASE=4.2.0-16-generic -C /lib/modules/4.2.0-16-generic/build M=/var/lib/dkms/psmouse/elantech-x551c/build/src psmouse.ko.....(bad exit status: 2)
ERROR (dkms apport): binary package for psmouse: elantech-x551c not found
Error! Bad return status for module build on kernel: 4.2.0-16-generic (x86_64)
Consult /var/lib/dkms/psmouse/elantech-x551c/build/make.log for more information.
The log file
DKMS make.log for psmouse-elantech-x551c for kernel 4.2.0-16-generic (x86_64)
Mon Oct 26 19:14:42 GMT 2015
make: Entering directory '/usr/src/linux-headers-4.2.0-16-generic'
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/psmouse-base.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/synaptics.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/alps.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/elantech.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/logips2pp.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/lifebook.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/sentelic.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/trackpoint.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/touchkit_ps2.o
CC [M] /var/lib/dkms/psmouse/elantech-x551c/build/src/cypress_ps2.o
/var/lib/dkms/psmouse/elantech-x551c/build/src/cypress_ps2.c: In function ‘cypress_process_packet’:
/var/lib/dkms/psmouse/elantech-x551c/build/src/cypress_ps2.c:543:2: error: too few arguments to function ‘input_mt_assign_slots’
input_mt_assign_slots(input, slots, pos, n);
^
In file included from /var/lib/dkms/psmouse/elantech-x551c/build/src/cypress_ps2.c:25:0:
include/linux/input/mt.h:121:5: note: declared here
int input_mt_assign_slots(struct input_dev *dev, int *slots,
^
scripts/Makefile.build:258: recipe for target '/var/lib/dkms/psmouse/elantech-x551c/build/src/cypress_ps2.o' failed
make[1]: *** [/var/lib/dkms/psmouse/elantech-x551c/build/src/cypress_ps2.o] Error 1
Makefile:1567: recipe for target 'psmouse.ko' failed
make: *** [psmouse.ko] Error 2
make: Leaving directory '/usr/src/linux-headers-4.2.0-16-generic'
