xscreensaver-data-extra is missing screensavers

I believe the following to be a complete list of screensavers mentioned in the package description, but not provided by the package:

ant
bsod
bubbles
critical
flag
forest
hyperball
hypercube
jigsqw
juggle
mismunch
petry (a typo of petri?)
qiz (a typo of qix?)
rotor
sphere
spiral
t3d
vines
whirlygig
worm

Some of these are provided by other packages, some of these are missing. I also noticed that a few screensavers provided by the package aren't listed in the description, so I guess it goes both ways and the description really needs updating. However, it would still be nice to see screensavers like hypercube back in the package :)

Just for completeness, the following is (I believe) a full list of screensavers the package provides that aren't mentioned in its description:

abstractile
cwaves
kaleidescope
kumppa
lcdscrub
ljlatest
loop
m6502
maze
petri
popsquares
qix

And another quick note: It seems karmic was the last distribution to contain hypercube, in xscreensaver-data-extra version 5.08-0ubuntu5. I haven't checked any of the other missing screensavers, though, and I don't know why they were removed - Debian also seems to have removed them from unstable and testing (and has the same inaccurate list Ubuntu is using), although not from the earlier package in Debian stable. The binaries of hypercube and hyperball both seem to run fine, though I can only test xscreensaver's binaries in windowed mode for some reason.

Thanks for your report. The package descriptions are not up to date. You can find on http://www.jwz.org/xscreensaver/changelog.html the reasons why some hacks have been retired.

In which case, the following list could be inserted into the package description:

abstractile, anemone, anemotaxis, apollonian, apple2, attraction, barcode, blaster, blitspin, bouboule, boxfit, braid, bumps, ccurve, celtic, cloudlife, compass, coral, crystal, cwaves, cynosure, decayscreen, deco, deluxe, demon, discrete, distort, drift, epicycle, eruption, euler2d, fadeplot, fireworkx, flame, flow, fluidballs, fontglide, galaxy, goop, grav, greynetic, halftone, halo, helix, hopalong, ifs, imsmap, interaggregate, interference, intermomentary, julia, kaleidescope, kumppa, lcdscrub, ljlatest, loop, m6502, maze, memscroller, metaballs, moire, moire2, mountain, munch, nerverot, noseguy, pacman, pedal, penetrate, penrose, petri, phosphor, piecewise, polyominoes, pong, popsquares, pyro, qix, rd-bomb, ripples, rocks, rorschach, rotzoomer, shadebobs, sierpinski, slidescreen, slip, sonar, speedmine, spotlight, squiral, starfish, strange, substrate, swirl, thornbird, triangle, truchet, twang, vermiculate, vidwhacker, wander, whirlwindwarp, wormhole, xanalogtv, xflame, xjack, xlyap, xmatrix, xrayswarm, xspirograph, zoom.

The above was taken straight from the current list of files in /usr/lib/xscreensaver/, with a text editor find and replace to make it into a nice list. Thanks for the link to the changelog :)

Below is a difference between those in 'Description' and
in fact represented in the /usr/lib/xscreensaver/ part of package:
-ant
-bsod
-bubbles
-critical
-flag
-forest
-hyperball
-hypercube
-jigsqw
-juggle
-mismunch
-petry
-qiz
-rotor
-sphere
-spiral
-t3d
-vines
-whirlygig
-worm
+abstractile
+cwaves
+kaleidescope
+kumppa
+lcdscrub
+ljlatest
+loop
+m6502
+maze
+petri
+popsquares
+qix
+xlyap

I propose to modify the control file as in the attached file.

The package description was updated at some point, for sure included in 5.42 (in 20.04).