AppSandbox 0.1.4 Ubuntu provisioning test 1

Warning

This is an unofficial test build. It is not an official AppSandbox release and is not intended for production use.

These fixes were mostly vibecoded with Codex using GPT-5.6 Sol Extra High. They were tested but have not received an independent human code review.

The replacement iso-patch.exe is not Authenticode-signed. Windows or security software may warn about or block it.

Purpose

This prerelease allows users to test the Ubuntu fixes proposed in:

• Pull request #120 — Fix Ubuntu "Installing Linux" hang and desktop runtime
• Issue #87 — VM stuck on installing

It fixes a reproduced failure where an Ubuntu VM started successfully but remained indefinitely on Installing Linux because its required build dependencies were not installed and the guest agent could not be compiled.

Included fixes

• Resolve offline build dependencies using Ubuntu's release, updates, and security package indexes
• Include build-essential, DKMS, matching kernel headers, and required agent dependencies
• Fail dependency prefetch when required packages or matching kernel headers are unavailable
• Restore the Linux capabilities required by snap-confine
• Fix Firefox and App Center failing to launch
• Disable GTK's problematic Vulkan backend while leaving OpenGL available
• Fix missing text in Ubuntu Settings
• Preserve the DRM framebuffer ID before releasing plane data, preventing stale or blank display frames

Build details

• Based on the official AppSandbox 0.1.4 Windows x64 release
• Fix source commit: c2833e6ecb8be3675cc22f691686847f14500a9c
• Source branch: EzYDark:fix/ubuntu-runtime
• Pull request: jamesstringer90/appsandbox#120
• AppSandbox.exe and appsandbox_core.dll are unchanged official binaries and retain their original signatures
• The replacement iso-patch.exe is locally built and unsigned

The test helper pins Linux guest-source downloads to:

ezydark/appsandbox@c2833e6ecb8be3675cc22f691686847f14500a9c

This ensures the VM receives the framebuffer fix from the same commit as the provisioning, Snap, and GTK fixes. The source pin is specific to this test package and is not part of pull request jamesstringer90#120.

Tested configuration

• Huawei KLVL-WXX9
• AMD Ryzen 7 4800H
• 16 GiB RAM
• AMD Radeon Graphics with GPU-PV
• AMD GPU driver 31.0.21925.1001
• Windows 11 IoT Enterprise LTSC, build 26100
• Ubuntu 26.04.1 Desktop AMD64
• Guest kernel 7.0.0-30-generic
• 4 vCPUs
• 4096 MB guest RAM
• 32 GB virtual disk
• NAT networking

Verified results

• A newly created VM completed Installing Linux
• The guest agent connected successfully
• Required kernel headers and DKMS modules were installed
• Agent, audio, display, and input services were active
• Ubuntu Settings rendered its text
• Firefox launched
• App Center opened
• The desktop accepted input and continued updating
• The downloaded appsandbox-display.c exactly matched commit c2833e6
• The release ZIP extracted successfully and all 44 files matched their original hashes

Installation

1. Download and extract the complete ZIP.
2. Run AppSandbox.exe from the extracted folder.
3. Create a new Ubuntu VM.
4. Keep internet access available while AppSandbox downloads the pinned guest source and Ubuntu package dependencies.
5. Do not use an existing VHDX when testing provisioning because these repairs run during VM creation and first boot.

Known limitations

• This build is intended for Ubuntu testing; Windows guest provisioning is unchanged.
• Existing Ubuntu VMs are not automatically repaired.
• The replacement iso-patch.exe is unsigned.
• The issue jamesstringer90#87 reporter used different hardware and must retest before that specific case can be considered confirmed.
• This package should remain marked as a prerelease.

Download verification

File:

AppSandbox-0.1.4-ubuntu-fixes-test.1-win-x64.zip

SHA-256:

2D55866A5276422D1122F56CA3750F9F656AD267672E14CD831ABAE5216F5832

Verify on Windows:

Get-FileHash .\AppSandbox-0.1.4-ubuntu-fixes-test.1-win-x64.zip -Algorithm SHA256