title: Cannot Install Parallels Tools on Ubuntu 18.04 LTS
body: <p>I can't install Parallels Tools on Ubuntu 18.04 LTS. Here is the error log:</p>
  
  <pre><code>Started installation of Parallels Guest Tools version '13.3.0.43321'
  
  Thu Apr 26 21:45:11 PDT 2018
  Start installation or upgrade of Guest Tools
  new version of parallels tools
  Installed Guest Tools were not found
  Perform installation into the /usr/lib/parallels-tools directory
  cat: /usr/lib/parallels-tools/kmods/../version: No such file or directory
  make: Entering directory '/usr/lib/parallels-tools/kmods'
  cd prl_eth/pvmnet &amp;&amp; make
  make[1]: Entering directory '/usr/lib/parallels-tools/kmods/prl_eth/pvmnet'
  make -C /lib/modules/4.15.0-20-generic/build M=/usr/lib/parallels-tools/kmods/prl_eth/pvmnet
  make[2]: Entering directory '/usr/src/linux-headers-4.15.0-20-generic'
  Makefile:976: "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel"
    CC [M]  /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/pvmnet.o
    LD [M]  /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/prl_eth.o
    Building modules, stage 2.
    MODPOST 1 modules
  FATAL: modpost: GPL-incompatible module prl_eth.ko uses GPL-only symbol 'sev_enable_key'
  scripts/Makefile.modpost:92: recipe for target '__modpost' failed
  make[3]: *** [__modpost] Error 1
  Makefile:1555: recipe for target 'modules' failed
  make[2]: *** [modules] Error 2
  make[2]: Leaving directory '/usr/src/linux-headers-4.15.0-20-generic'
  /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/Makefile.v26:11: recipe for target 'all' failed
  make[1]: *** [all] Error 2
  make[1]: Leaving directory '/usr/lib/parallels-tools/kmods/prl_eth/pvmnet'
  Makefile.kmods:34: recipe for target 'installme' failed
  make: *** [installme] Error 2
  make: Leaving directory '/usr/lib/parallels-tools/kmods'
  Error: could not build kernel modules
  Error: failed to install kernel modules
  Error: failed to install Parallels Guest Tools!
  Please, look at /var/log/parallels-tools-install.log file for more information.
  </code></pre>
  
  <p>However, when installing Parallels Tools on Ubuntu 16.04 LTS, everything went fine. </p>