Error updating driver for GTX980

I’m updating the driver and updating CUDA from 7.0 to 7.5. The driver installation did not finish succesfully, and the screen now is in low resolution mode.

Here is the log in /var/log/nvidia-installer.log

Using built-in stream user interface
-> Detected 8 CPUs online; setting concurrency level to 8.
-> License accepted by command line option.
-> Installing NVIDIA driver version 352.39.
-> There appears to already be a driver installed on your system (version: 352.39). As part of installing this driver (version: 352.39), the existing driver will be uninstalled.
Are you sure you want to continue? (Answer: Continue installation)
-> Running distribution scripts
executing: ‘/usr/lib/nvidia/pre-install’…
-> done.
-> The distribution-provided pre-install script failed! Are you sure you want to continue? (Answer: Continue installation)
WARNING: One or more modprobe configuration files to disable Nouveau are already present at: /etc/modprobe.d/nvidia-installer-disable-nouveau.conf. Please be sure you have reboo
ted your system since these files were written. If you have rebooted, then Nouveau may be enabled for other reasons, such as being included in the system initial ramdisk or in y
our X configuration file. Please consult the NVIDIA driver README and your Linux distribution’s documentation for details on how to correctly disable the Nouveau kernel driver.
-> For some distributions, Nouveau can be disabled by adding a file in the modprobe configuration directory. Would you like nvidia-installer to attempt to create this modprobe f
ile for you? (Answer: Yes)
-> One or more modprobe configuration files to disable Nouveau have been written. For some distributions, this may be sufficient to disable Nouveau; other distributions may requ
ire modification of the initial ramdisk. Please reboot your system and attempt NVIDIA driver installation again. Note if you later wish to reenable Nouveau, you will need to de
lete these files: /etc/modprobe.d/nvidia-installer-disable-nouveau.conf
-> Would you like to register the kernel module sources with DKMS? This will allow DKMS to automatically build a new module, if you install a different kernel later. (Answer: Yes
)
-> Installing both new and classic TLS OpenGL libraries.
-> Installing both new and classic TLS 32bit OpenGL libraries.
-> Install NVIDIA’s 32-bit compatibility libraries? (Answer: Yes)
-> Uninstalling the previous installation with /usr/bin/nvidia-uninstall.
-> nvidia-installer will install the libvdpau and libvdpau_trace libraries that were included with this installer package. These libraries are available separately through the li
bvdpau project and will be removed from the NVIDIA Linux driver installer package in the future, so it is recommended that VDPAU users install libvdpau separately, e.g. by using
packages available from their distributions, or by building from the sources available at:

http://people.freedesktop.org/~aplattner/vdpau
-> Searching for conflicting files:
-> done.
-> Installing ‘NVIDIA Accelerated Graphics Driver for Linux-x86_64’ (352.39):
executing: ‘/sbin/ldconfig’…
-> done.
-> Driver file installation is complete.
-> Installing DKMS kernel module:
ERROR: Failed to run /usr/sbin/dkms build -m nvidia -v 352.39 -k 3.13.0-55-generic:
Kernel preparation unnecessary for this kernel. Skipping…

Building module:
cleaning build area…
make KERNELRELEASE=3.13.0-55-generic module KERNEL_UNAME=3.13.0-55-generic; make -C uvm module KERNEL_UNAME=3.13.0-55-generic KBUILD_EXTMOD=/var/lib/dkms/nvidia/352.39/build/uvm.
…(bad exit status: 2)
ERROR (dkms apport): binary package for nvidia: 352.39 not found
Error! Bad return status for module build on kernel: 3.13.0-55-generic (x86_64)
Consult /var/lib/dkms/nvidia/352.39/build/make.log for more information.
-> error.
ERROR: Failed to install the kernel module through DKMS. No kernel module was installed; please try installing again without DKMS, or check the DKMS logs for more information.
ERROR: Installation has failed. Please see the file ‘/var/log/nvidia-installer.log’ for details. You may find suggestions on fixing installation problems in the README availabl
e on the Linux driver download page at www.nvidia.com.