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I use a vnc (tightvncserver) connection: Devuan/aarch64 and Armbian(Debian)/armfh (hosts) thru Win10/TigerVNC (client).

Since the upgrade of the underlying base to Debian Bookworm, xscreensaver and any other locker fail to run for the same reason:

xscreensaver --no-splash xscreensaver: 12:09:54: XInput extension missing xtrlock -f xtrlock (version 2.15): No X Input extension

I reached out the Xscreensaver developer, and he told me the Debian package brings with it all the necessary dependencies, and he doesn't know where the problem is.

I also installed a bunch of additional packages but nothing has changed:

libx11-xcb1/stable-security,now 2:1.8.4-2+deb12u2 arm64 [installed,automatic] libxcb-damage0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-dri2-0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-dri3-0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-glx0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-icccm4/stable,now 0.4.1-1.1 arm64 [installed,automatic] libxcb-image0/stable,now 0.4.0-2 arm64 [installed,automatic] libxcb-keysyms1/stable,now 0.4.0-1+b2 arm64 [installed,automatic] libxcb-present0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-randr0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-render-util0/stable,now 0.3.9-1+b1 arm64 [installed,automatic] libxcb-render0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-screensaver0/stable,now 1.15-1 arm64 [installed] libxcb-shape0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-shm0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-sync1/stable,now 1.15-1 arm64 [installed,automatic] libxcb-util1/stable,now 0.4.0-1+b1 arm64 [installed,automatic] libxcb-xfixes0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-xinerama0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-xinput0/stable,now 1.15-1 arm64 [installed,automatic] libxcb-xkb1/stable,now 1.15-1 arm64 [installed,automatic] libxcb1-dev/stable,now 1.15-1 arm64 [installed,automatic] libxcb1/stable,now 1.15-1 arm64 [installed,automatic]

On Bullseye, xscreensaver and other lockers were working just fine, I can't figure out how to fix this, thanks!

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I solved my issue, in the terms that I found a screen locker that works on the VNC session.

As a matter of fact slock from the suckless-tools works without complaining.

To trigger it I use xautolock in combination with the slock.

If you are on a Debian based GNU/Linux distribution you can install them with:

# apt install suckless-tools xautolock

This is my .vnc/xstartup

.vnc/xstartup #!/bin/sh # Load X resources (if any) if [ -e "$HOME/.Xresources" ] then xrdb "$HOME/.Xresources" fi # xsetroot -solid black xmodmap -e "keysym Alt_L = Multi_key" & x-terminal-emulator -geometry "80x24+10+10" -ls -title "$VNCDESKTOP Desktop" & x-window-manager & xautolock -time 1 -locker slock &

The last line is the command that launch the aforementioned packages in background.

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