Warnings when building goconserver on Ubuntu 18

[gurevichmark]

When building goconserver on Ubuntu 18, the following warnings are issued:

npm WARN deprecated extract-text-webpack-plugin@3.0.2: Deprecated. Please use https://github.com/webpack-contrib/mini-css-extract-plugin
npm WARN deprecated browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
npm WARN deprecated gulp-util@3.0.8: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated graceful-fs@1.2.3: please upgrade to graceful-fs 4 for compatibility with current and future versions of Node.js
npm WARN deprecated natives@1.1.6: This module relies on Node.js's internals and will break at some point. Do not use it, and update to graceful-fs@4.x.
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
WARN engine watchpack-chokidar2@2.0.0: wanted: {"node":"<8.10.0"} (current: {"node":"8.10.0","npm":"3.5.2"})
WARN engine fsevents@2.1.3: wanted: {"node":"^8.16.0 || ^10.6.0 || >=11.0.0"} (current: {"node":"8.10.0","npm":"3.5.2"})
npm WARN deprecated chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
npm WARN prefer global node-gyp@3.8.0 should be installed with -g