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FAQ in Windows OS

Windows security Unable to save permission changes on hosts Access is denied answer: close anti-virus software OpenGL 2.0 or greater required.  Right-click the desktop, and choose "Screen resolution" from the popup menu. Click "Advanced settings" under Resolution.  Click the "Properties" button on the Adapter tab:   Click the "Update Driver..." button on the Driver tab: from:https://iscreensaver.com/help/notes/update_opengl_drivers/update_opengl_drivers.shtml#easyW7

Update

how-to-install-updates-via-command-line   sudo apt-get update # Fetches the list of available updates sudo apt-get upgrade # Strictly upgrades the current packages sudo apt-get dist-upgrade # Installs updates (new ones)