Ubuntu 22.04 defaults to WaylandEnable=true in /etc/gdm3/custom.conf.
Wayland + x11vnc has known issues (keyboard remap, clipboard, gnome-shell
crashes on X events). Add two options: disable_wayland (write
WaylandEnable=false to gdm3/custom.conf on GNOME installs, guarded when no
gdm3 exists) and restart_gdm (immediately restart gdm vs apply on reboot).
Go official tarball always extracts to <parent>/go. The old code always ran
'mv <parent>/go <install_dir>', which errors with 'cannot move /opt/go to a
subdirectory of itself' when install_dir equals the extraction target (the
default /opt/go). Only emit the mv when install_dir differs from the tar
extraction path.
Both Node.js and Java generators were emitting URLs that 404'd when
selected against the official dist servers.
Node.js: emitted v<major>.x placeholders (e.g. v24.x). nodejs.org's
dist server requires exact version paths (e.g. v24.19.0); the v<x>.x
form is not a redirect — it's a real 404. All 5 supported majors
(18, 20, 22, 24, 26) were broken.
Java: URL was hardcoded to download.java.net's openjdk-21.0.2 GA
build. That path only works for 21; 8, 11, 17 all 404. download.java.net
embeds a build hash in the URL that I don't have a way to look up
for arbitrary patch versions.
Fix:
Node.js: add a LATEST_KNOWN dict mapping each major to its real
current exact version (refreshed 2026-08):
18 -> 18.20.8, 20 -> 20.20.2, 22 -> 22.23.2,
24 -> 24.19.0, 26 -> 26.6.0
Also add a 'download_url' text field with the precise default URL,
so users can override with any mirror (Tuna, npmmirror, etc.) or
a specific patch version without waiting for code to update.
Java: switch to Tuna's Adoptium mirror, whose path format is simple
and predictable:
https://mirrors.tuna.tsinghua.edu.cn/Adoptium/<major>/jdk/x64/linux/OpenJDK<major>U-jdk_x64_linux_hotspot_<exact>.tar.gz
This works for 8/11/17/21 with the LATEST_TUNA mapping. Also add a
'download_url' text field for overrides.
Both also derive the tarball's inner directory name from the URL (via
regex) so the --strip-components=1 trick keeps working even when the
user picks a custom URL.
Verified all 9 generated URLs return 200 (HEAD):
Node v18/20/22/24/26: all 200
Java v8/11/17/21: all 200 (Tuna mirror)
All 50 generators still pass bash -n.
Major changes to the VNC generator (generators/middleware.py):
1. Replace Xtigervnc + vncserver wrapper with xvfb + x11vnc.
- Xtigervnc defaults to daemon mode (no -fg flag exists), so systemd
Type=simple couldn't track it; x11vnc attaches to Xvfb in
foreground, works cleanly with Type=simple.
- Use display :99 via xvfb-run -a so we never collide with the
physical GDM/Xorg on :0 (avoids 'server already running').
2. GNOME xstartup: switch to Ubuntu's canonical session.
- XDG_CURRENT_DESKTOP=ubuntu:GNOME (was 'GNOME'; the bare form
doesn't match Ubuntu's /usr/share/gnome-session/sessions/ entry
and apps like gnome-terminal refuse to launch).
- XDG_SESSION_TYPE=x11 (x11vnc is X11-only, so be explicit).
- GNOME_SHELL_SESSION_MODE=ubuntu (Ubuntu-patched gnome-shell hint).
3. Install extra GNOME packages needed for a usable VNC desktop.
ubuntu-desktop-minimal alone leaves the user with a blank desktop
and no way to launch apps. Add:
- gnome-shell-extension-desktop-icons-ng (desktop icons)
- gnome-terminal (terminal app)
- nautilus-extension-gnome-terminal (right-click → open in terminal)
- gnome-tweaks (advanced settings UI)
4. Two new UI options:
- 'Disable Unix socket (-nolisten unix)' — default on (avoids GDM
collision on /tmp/.X11-unix/X0).
- 'Disable X11 TCP listener (6001)' — default off (frees 6001 when
GDM is squatting on it).
5. .gitignore: exclude other projects' deliverables/ directory and
a few test output scripts (vnc_*.sh).
cnbug