Cross-platform install fails: Grid-based SISR requirements.txt contains Linux-only packages (Brlapi / python-apt / systemd-python)

[huberthuang0930]

Environment

• OS: Windows 10
• Python: 3.11.9
• Fresh venv

Context
PR #97 correctly removes the apturl==0.5.2 blocker and allows the install to proceed past that point. This issue is a follow-up: requirements.txt still includes Ubuntu/Linux-only packages that prevent installation on Windows/macOS.

Steps to reproduce

1. cd Grid_based_strong_lensing_for_unsupervised_super_resolution_Anirudh_Shankar
2. py -3.11 -m venv .venv
3. ..venv\Scripts\Activate.ps1
4. pip install -r requirements.txt

Evidence: Linux-only deps present in requirements.txt
Command:
Select-String -Path ".\requirements.txt" -Pattern "python-apt|systemd|Brlapi|apturl"

Output:

• Brlapi==0.8.3 (line 5)
• python-apt==2.4.0+ubuntu4 (line 111)
• systemd-python==234 (line 129)
• (apturl is no longer present — PR Fix: remove non-pip apturl dependency to enable cross-platform setup #97 fixed that)

Observed behavior
Install fails on Windows due to Brlapi not being available on PyPI:

ERROR: Could not find a version that satisfies the requirement Brlapi==0.8.3 (from versions: none)
ERROR: No matching distribution found for Brlapi==0.8.3

[kunalsanga]

Thanks for opening this follow-up issue.

This looks like a broader cleanup of Linux-only / platform-specific
dependencies (e.g. Brlapi, python-apt, systemd-python), which goes
beyond the scope of the apturl fix in #97.

Happy to help here if maintainers agree on the preferred direction
(e.g. splitting platform-specific dependencies into an optional
requirements file or documenting OS-specific setup).