>>> Extracting info
 * Package:    app-emulation/virtualbox-modules-5.2.14
 * Repository: gentoo
 * USE:        userland_GNU elibc_glibc amd64 kernel_linux abi_x86_64
 * FEATURES:   compressdebug preserve-libs sandbox splitdebug userpriv usersandbox
error writing group entry: Invalid argument
 * Adding group 'vboxusers' to your system ...
 *  - Groupid: next available
groupadd: group 'vboxusers' already exists
 * ERROR: app-emulation/virtualbox-modules-5.2.14::gentoo failed (setup phase):
 *   (no error message)
 * 
 * Call stack:
 *     ebuild.sh, line  124:  Called pkg_setup
 *   environment, line 3213:  Called enewgroup 'vboxusers'
 *   environment, line 1156:  Called die
 * The specific snippet of code:
 *               groupadd -r ${opts} "${egroup}" || die
 * 
 * If you need support, post the output of `emerge --info '=app-emulation/virtualbox-modules-5.2.14::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-emulation/virtualbox-modules-5.2.14::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/app-emulation/virtualbox-modules-5.2.14/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-emulation/virtualbox-modules-5.2.14/temp/environment'.
 * Working directory: '/var/tmp/portage/app-emulation/virtualbox-modules-5.2.14/homedir'
 * S: '/var/tmp/portage/app-emulation/virtualbox-modules-5.2.14/work/virtualbox-modules-5.2.14'