I want to install the GPU card driver for GTX 2070 on Ubuntu 18.04

$sudo./NVIDIA-Linux-x86_64-430.14.run --silent --no-opengl-files --no-libglx-indirect --dkms
Verifying archive integrity...OK
Uncompressing NVIDIA Accelerated Graphics Driver for Linux-x86_64 430.14..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

WARNING—Unable to find a sustainable destination to install 32-bit compatibility
         libraries.Your system may not be setup for 32-bit compatibility.
         32-bit compatibility files will not be installed; if you wish to
         install them, re-run the installation and set a valid directory with
         the --compat32-libdir option.

ERROR: Failed to run`/usr/sbin/dkms build-mnvidia-v430.14-k
       4.15.0-50-generic`: 
       Kernel preparation unknown for this kernel.Skipping...

       Building module:
       Cleaning build area...
       'make'-j8NV_EXCLUDE_BUILD_MODULES='KERNEL_UNAME=4.15.0-50-generic
       IGNORE_CC_MISMATCH='modules...(bad exit status:2)
       ERROR(dkms apport): binary package for nvidia:430.14 not found
       Error! Bad return status for module build on kernel: 4.15.0-50-generic
       (x86_64)
       Consult/var/lib/dkms/nvidia/430.14/build/make.log for more
       Information.

ERROR—Failed to install the kernel module through DKMS.Nokernel 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 available on the Linux
       driver download page at www.nvidia.com.

$cat/var/log/nvidia-installer.log 
nvidia-installer log file '/var/log/nvidia-installer.log'
creation time:Sun May 2609:36:54 2019
installer version:430.14

PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/sbin:/snap/bin

nvidia-installer command line:
    ./nvidia-installer
    --no-opengl-files
    --no-libglx-indirect
    --dkms

Unable to load —nvidia-installer ncurses v6 user interface

Using—nvidia-installer ncurses user interface
->Detected 8 CPUs online;setting concurrency level to 8.
- > Installing NVIDIA driver version 43.14.
->There applications to already be a driver installed on your system (version:430.14).As part of installing this driver (version:430.14), the existing driver will be installed. 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)
- > 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)
WARNING:Unable to find a continuous destination to install 32-bit compatibility libraries. Your system may not be set up for 32-bit compatibility.32-bit compatibility files will not be installed; if you wish to install them, re-run the installation and set a valid directory -- composition.
->Uninstalling the previous installation with /usr/bin/nvidia-uninstall.
->Searching for conflict files:
->done.
- > Installing 'NVIDIA Accelerated Graphics Driver for Linux-x86_64' (430.14):
   executing: '/sbin/ldconfig'...
->done.
->Driver file installation is complete.
- > Installing DKMS kernel module:
ERROR: Failed to run`/usr/sbin/dkms build-mnvidia-v430.14-k4.15.0-50-generic`: 
Kernel preparation unknown for this kernel.Skipping...

Building module:
Cleaning build area...
'make'-j8NV_EXCLUDE_BUILD_MODULES='KERNEL_UNAME=4.15.0-50-generic IGNORE_CC_MISMATCH='modules...(bad exit status:2)
ERROR(dkms apport): binary package for nvidia:430.14 not found
Error! Bad return status for module build on kernel: 4.15.0-50-generic (x86_64)
Consult/var/lib/dkms/nvidia/430.14/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 available on the Linux driver download page at www.nvidia.com.

$sudo apt-get remove nvidia-*
$ sudo apt-get remove cuda-*

$uname-a
Linux xf 4.15.0-48-generic#51-Ubuntu SMP Wet Apr 308:28:49 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

$gcc --version
gcc (Ubuntu 7.4.0-1 ubuntu 1 to 18.04) 7.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.