/usr/share/xscreensaver/config/blocktube.xml is in xscreensaver-gl-extra 5.15-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="blocktube" _label="BlockTube">
<command arg="-root"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="40000"
convert="invert"/>
<number id="holdtime" type="slider" arg="-holdtime %"
_label="Color hold time" _low-label="Short" _high-label="Long"
low="10" high="2000" default="1000"/>
<number id="changetime" type="slider" arg="-changetime %"
_label="Color change time" _low-label="Short" _high-label="Long"
low="10" high="1000" default="200"/>
<boolean id="tex" _label="Textured" arg-unset="-no-texture"/>
<boolean id="wire" _label="Wireframe" arg-set="-wireframe"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
Draws a swirling, falling tunnel of reflective slabs. They fade from
hue to hue.
Written by Lars R. Damerow; 2003.
</_description>
</screensaver>
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