[SOLVED] xscreensaver is not present in the settings tools, in the starting app tab.

would need to know about your desktop emvironment to give better answers:

OS: Debian GNU/Linux 9.4 (stretch) x86_64
Host: Inspiron 1545
Kernel: 4.9.0-6-amd64
Uptime: 3 hours, 50 mins
Packages: 2032 (dpkg)
Shell: bash 4.4.12
Resolution: 1366x768
DE: GNOME 3.22.3
WM: GNOME Shell
WM Theme: Adwaita
Theme: Adwaita [GTK2/3]
Icons: Adwaita [GTK2/3]
Terminal: gnome-terminal
CPU: Intel Core 2 Duo P8600 (2) @ 2.401GHz
GPU: Intel Mobile 4 Series Chipset
Memory: 1995MiB / 3916MiB

Those information was obtained with the command: neofetch --distro_shorthand off
Now I think you have all the information about my Laptop and the system I am running.
By the way, what does mean "btw"?
What option had to start xscreensaver without the splash screen?
thanks or your kindness and patience.

Originally Posted by nogueira13 By the way, what does mean "btw"?

Lol funny quote

Originally Posted by nogueira13 What option had to start xscreensaver without the splash screen? thanks or your kindness and patience.

xscreensaver -no-splash

Now I look at Google to know the meaning of btw e ele significa "by the way"... kkk kkk Now I knew why you lough...
Thanks a lot for the answer about o xscreensaver -n-splash. But and about the fact it is not present in the "Settings Tools" --> "Startup App" list drop? Have any idea?

Maybe, the man page of xscreensaver has some guide to setup the screensaver in various desktops
The part about GNOME says:

       For the better part of a decade, GNOME shipped xscreensaver as-is,  and
       everything  just worked out of the box.  In 2005, however, they decided
       to re-invent the wheel and ship their own replacement for the  xscreen-
       saver daemon called "gnome-screensaver", rather than improving xscreen-
       saver and contributing their changes back.  As a  result,  the  "gnome-
       screensaver" program is insecure, bug-ridden, and missing many features
       of xscreensaver.  You shouldn't use it.

       To replace gnome-screensaver with xscreensaver:

           1: Fully uninstall the gnome-screensaver package.
              sudo apt-get remove gnome-screensaver
              or possibly
              sudo dpkg -P gnome-screensaver

           2: Launch xscreensaver at login.
              Select "Startup Applications" from the menu (or manually  launch
              "gnome-session-properties") and add "xscreensaver".

              Do  this as your normal user account, not as root.  (This should
              go without saying, because  you  should  never,  ever,  ever  be
              logged in to the graphical desktop as user "root".)

           3: Make GNOME's "Lock Screen" use xscreensaver.
              sudo ln -sf /usr/bin/xscreensaver-command \
                          /usr/bin/gnome-screensaver-command
              That  doesn't  work  under Unity, though.  Apparently it has its
              own built-in screen locker which is not  gnome-screensaver,  and
              cannot  be  removed,  and yet still manages to be bug-addled and
              insecure.  Keep reinventing that wheel, guys!  (If you have fig-
              ured  out how to replace Unity's locking "feature" with xscreen-
              saver, let me know.)

           4: Turn off Unity's built-in blanking.
              Open "System Settings / Brightness & Lock";
              Un-check "Start Automatically";
              Set "Turn screen off when inactive for" to "Never."

Originally Posted by nogueira13 Thanks a lot for the answer about o xscreensaver -n-splash. But and about the fact it is not present in the "Settings Tools" --> "Startup App" list drop? Have any idea?

i'm sure you can ADD something to that list, no?

if not (this is entirely possible), then i must say that gnome is simply evil.

btw (sic), please make sure you type commands correctly. your computer does not autocorrect these things.

I am giving up. I will start xscreensaver manually using the xscreensaver-demo command at every boot up of my linux. Thank you very much for your help

Now I am using Linux Mint 19.2 and when I start xscreensaver for the first time I receive the following message: "It seems that the xscreensaver daemon is not being executed in monitor ".0" Launch it now?"
How could I fix up this problem?

Originally Posted by nogueira13 Now I am using Linux Mint 19.2 and when I start xscreensaver for the first time I receive the following message: "It seems that the xscreensaver daemon is not being executed in monitor ".0" Launch it now?" How could I fix up this problem?

Apparently xscreensaver is not being started automatically.
The trend nowadays is to not use old-style screensavers anymore; plain blanking and/or locking is prefered ( = power management).
Fix: add the command 'xscreensaver' to your startup (or autostart) applications.

I moved to Linux Mint 19.2 and it is working properly now. How can I close this topic?

You don't close topics, because each and every topic has the potential to help others with same/similar problems, and should thus remain visible.
That's the main purpose of forums.
If you think it's SOLVED, mark it so.