I commented out both lines in BOTH files (nvidia-graphics-drivers.conf and nvidia-304_hybrid.conf), but apparently this has not helped, here is the latest output of apt-get upgrade: Setting up nvidia-304 (304.84-0ubuntu1) ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/nvidia-304/ld.so.conf because link group x86_64-linux-gnu_gl_conf is broken update-initramfs: deferring update (trigger activated) update-initramfs: Generating /boot/initrd.img-3.8.0-8-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped) INFO:Enable nvidia-304 DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here Loading new nvidia-304-304.84 DKMS files... Building for 3.8.0-8-generic and 3.8.0-9-generic Building for architecture x86_64 Building initial module for 3.8.0-8-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-8-generic/updates/dkms/ depmod.... DKMS: install completed. Building initial module for 3.8.0-9-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-9-generic/updates/dkms/ depmod.... DKMS: install completed. Setting up ubuntu-artwork (1:13.04daily13.03.05-0ubuntu1) ... Setting up unity-lens-music (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-lens-shopping (6.8.0daily13.03.04-0ubuntu1) ... Setting up unity-lens-video (0.3.14daily13.03.04-0ubuntu1) ... Setting up unity-scope-musicstores (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-scope-video-remote (0.3.14daily13.03.04-0ubuntu1) ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Setting up nvidia-current (304.84-0ubuntu1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-9-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped)Setting up nvidia-304 (304.84-0ubuntu1) ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/nvidia-304/ld.so.conf because link group x86_64-linux-gnu_gl_conf is broken update-initramfs: deferring update (trigger activated) update-initramfs: Generating /boot/initrd.img-3.8.0-8-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped) INFO:Enable nvidia-304 DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here Loading new nvidia-304-304.84 DKMS files... Building for 3.8.0-8-generic and 3.8.0-9-generic Building for architecture x86_64 Building initial module for 3.8.0-8-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-8-generic/updates/dkms/ depmod.... DKMS: install completed. Building initial module for 3.8.0-9-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-9-generic/updates/dkms/ depmod.... DKMS: install completed. Setting up ubuntu-artwork (1:13.04daily13.03.05-0ubuntu1) ... Setting up unity-lens-music (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-lens-shopping (6.8.0daily13.03.04-0ubuntu1) ... Setting up unity-lens-video (0.3.14daily13.03.04-0ubuntu1) ... Setting up unity-scope-musicstores (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-scope-video-remote (0.3.14daily13.03.04-0ubuntu1) ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Setting up nvidia-current (304.84-0ubuntu1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-9-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped)Setting up nvidia-304 (304.84-0ubuntu1) ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/nvidia-304/ld.so.conf because link group x86_64-linux-gnu_gl_conf is broken update-initramfs: deferring update (trigger activated) update-initramfs: Generating /boot/initrd.img-3.8.0-8-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped) INFO:Enable nvidia-304 DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here Loading new nvidia-304-304.84 DKMS files... Building for 3.8.0-8-generic and 3.8.0-9-generic Building for architecture x86_64 Building initial module for 3.8.0-8-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-8-generic/updates/dkms/ depmod.... DKMS: install completed. Building initial module for 3.8.0-9-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-9-generic/updates/dkms/ depmod.... DKMS: install completed. Setting up ubuntu-artwork (1:13.04daily13.03.05-0ubuntu1) ... Setting up unity-lens-music (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-lens-shopping (6.8.0daily13.03.04-0ubuntu1) ... Setting up unity-lens-video (0.3.14daily13.03.04-0ubuntu1) ... Setting up unity-scope-musicstores (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-scope-video-remote (0.3.14daily13.03.04-0ubuntu1) ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Setting up nvidia-current (304.84-0ubuntu1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-9-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped)Setting up nvidia-304 (304.84-0ubuntu1) ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/nvidia-304/ld.so.conf because link group x86_64-linux-gnu_gl_conf is broken update-initramfs: deferring update (trigger activated) update-initramfs: Generating /boot/initrd.img-3.8.0-8-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped) INFO:Enable nvidia-304 DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here Loading new nvidia-304-304.84 DKMS files... Building for 3.8.0-8-generic and 3.8.0-9-generic Building for architecture x86_64 Building initial module for 3.8.0-8-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-8-generic/updates/dkms/ depmod.... DKMS: install completed. Building initial module for 3.8.0-9-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-9-generic/updates/dkms/ depmod.... DKMS: install completed. Setting up ubuntu-artwork (1:13.04daily13.03.05-0ubuntu1) ... Setting up unity-lens-music (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-lens-shopping (6.8.0daily13.03.04-0ubuntu1) ... Setting up unity-lens-video (0.3.14daily13.03.04-0ubuntu1) ... Setting up unity-scope-musicstores (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-scope-video-remote (0.3.14daily13.03.04-0ubuntu1) ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Setting up nvidia-current (304.84-0ubuntu1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-9-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped)Setting up nvidia-304 (304.84-0ubuntu1) ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/nvidia-304/ld.so.conf because link group x86_64-linux-gnu_gl_conf is broken update-initramfs: deferring update (trigger activated) update-initramfs: Generating /boot/initrd.img-3.8.0-8-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped) INFO:Enable nvidia-304 DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here Loading new nvidia-304-304.84 DKMS files... Building for 3.8.0-8-generic and 3.8.0-9-generic Building for architecture x86_64 Building initial module for 3.8.0-8-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-8-generic/updates/dkms/ depmod.... DKMS: install completed. Building initial module for 3.8.0-9-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-9-generic/updates/dkms/ depmod.... DKMS: install completed. Setting up ubuntu-artwork (1:13.04daily13.03.05-0ubuntu1) ... Setting up unity-lens-music (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-lens-shopping (6.8.0daily13.03.04-0ubuntu1) ... Setting up unity-lens-video (0.3.14daily13.03.04-0ubuntu1) ... Setting up unity-scope-musicstores (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-scope-video-remote (0.3.14daily13.03.04-0ubuntu1) ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Setting up nvidia-current (304.84-0ubuntu1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-9-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped)Setting up nvidia-304 (304.84-0ubuntu1) ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/nvidia-304/ld.so.conf because link group x86_64-linux-gnu_gl_conf is broken update-initramfs: deferring update (trigger activated) update-initramfs: Generating /boot/initrd.img-3.8.0-8-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped) INFO:Enable nvidia-304 DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here Loading new nvidia-304-304.84 DKMS files... Building for 3.8.0-8-generic and 3.8.0-9-generic Building for architecture x86_64 Building initial module for 3.8.0-8-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-8-generic/updates/dkms/ depmod.... DKMS: install completed. Building initial module for 3.8.0-9-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-9-generic/updates/dkms/ depmod.... DKMS: install completed. Setting up ubuntu-artwork (1:13.04daily13.03.05-0ubuntu1) ... Setting up unity-lens-music (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-lens-shopping (6.8.0daily13.03.04-0ubuntu1) ... Setting up unity-lens-video (0.3.14daily13.03.04-0ubuntu1) ... Setting up unity-scope-musicstores (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-scope-video-remote (0.3.14daily13.03.04-0ubuntu1) ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Setting up nvidia-current (304.84-0ubuntu1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-9-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped)Setting up nvidia-304 (304.84-0ubuntu1) ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/nvidia-304/ld.so.conf because link group x86_64-linux-gnu_gl_conf is broken update-initramfs: deferring update (trigger activated) update-initramfs: Generating /boot/initrd.img-3.8.0-8-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped) INFO:Enable nvidia-304 DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here Loading new nvidia-304-304.84 DKMS files... Building for 3.8.0-8-generic and 3.8.0-9-generic Building for architecture x86_64 Building initial module for 3.8.0-8-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-8-generic/updates/dkms/ depmod.... DKMS: install completed. Building initial module for 3.8.0-9-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-9-generic/updates/dkms/ depmod.... DKMS: install completed. Setting up ubuntu-artwork (1:13.04daily13.03.05-0ubuntu1) ... Setting up unity-lens-music (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-lens-shopping (6.8.0daily13.03.04-0ubuntu1) ... Setting up unity-lens-video (0.3.14daily13.03.04-0ubuntu1) ... Setting up unity-scope-musicstores (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-scope-video-remote (0.3.14daily13.03.04-0ubuntu1) ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Setting up nvidia-current (304.84-0ubuntu1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-9-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped)Setting up nvidia-304 (304.84-0ubuntu1) ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/nvidia-304/ld.so.conf because link group x86_64-linux-gnu_gl_conf is broken update-initramfs: deferring update (trigger activated) update-initramfs: Generating /boot/initrd.img-3.8.0-8-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped) INFO:Enable nvidia-304 DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here Loading new nvidia-304-304.84 DKMS files... Building for 3.8.0-8-generic and 3.8.0-9-generic Building for architecture x86_64 Building initial module for 3.8.0-8-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-8-generic/updates/dkms/ depmod.... DKMS: install completed. Building initial module for 3.8.0-9-generic Done. nvidia_304: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.8.0-9-generic/updates/dkms/ depmod.... DKMS: install completed. Setting up ubuntu-artwork (1:13.04daily13.03.05-0ubuntu1) ... Setting up unity-lens-music (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-lens-shopping (6.8.0daily13.03.04-0ubuntu1) ... Setting up unity-lens-video (0.3.14daily13.03.04-0ubuntu1) ... Setting up unity-scope-musicstores (6.8.1daily13.03.04-0ubuntu1) ... Setting up unity-scope-video-remote (0.3.14daily13.03.04-0ubuntu1) ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Setting up nvidia-current (304.84-0ubuntu1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.8.0-9-generic modprobe: ../tools/modprobe.c:550: print_action: Assertion `kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN' failed. Aborted (core dumped)