[Bug][Linux] (7/1/2025) Steam webhelper crashing, causing Steam UI to never display.

[shdwmtr]

Before Reporting

• [x] I found no existing issues matching my bug
• [x] My issue is not caused by a theme
• [x] My issue is not caused by a plugin

Describe the Bug

As of July 1st, 2025, Steam has pushed changes to the Steam Client which break Millennium & Steam together.

Expected Behavior

Steam launches normally.

Steps To Reproduce

1. Run Steam

Operating System

Linux

Anything else?

No response

[shdwmtr]

This is a known issue and we are currently working on a solution.

[MrAdrianPl]

Hi, sorry to budge but is there any way to start steam in clean state without uninstalling Millennium?

[Zetabite]

Hi, sorry to budge but is there any way to start steam in clean state without uninstalling Millennium?

I don't think so. For the time I have just reinstalled steam which removes millenium patch. It should apply all plugins once the millenium patch is running again.

[The-EDev]

Hi, sorry to budge but is there any way to start steam in clean state without uninstalling Millennium?

you should be able to just use the steam.millennium.bak file, rename that to steam and it should un-patch it

[HollyBlocky]

This appears to also be the case on Windows 11, too, where the webhelper crashes on startup

[shdwmtr]

@HollyBlocky Likely an unrelated issue. These recent changes only came to the linux branch of steam.

[cpulley]

Looks like the patch today/last night (2.26.0-beta.14) is working on my system! Thanks for the quick work!

[SteamRex25]

I could procduce logs of whats happening on my end if needed

[shdwmtr]

As @cpulley mentions, checkout 2.26.0-beta.14. It should fix the issue!

[SteamRex25]

I mentioned in the discord that I'm already on 2.26.0-beta.14. user there is Sawyer/royalrex25

[unexp]

As @cpulley mentions, checkout 2.26.0-beta.14. It should fix the issue!

I just did the manual install for 2.26.0-beta.14, and it launches, but now the package manager breaks because it can't find $HOME/.local/share/millennium/.venv/bin/python3.11

I just did the same process as the installer usually does, is this just user error or is the release asset supposed to include that?

[shdwmtr]

@unexp Send logs

[HollyBlocky]

@HollyBlocky Likely an unrelated issue. These recent changes only came to the linux branch of steam.

Understood, found out from reinstalling Millennium that the Aerotheme, or Office 2007 theme, has its plugin now broken which is what was causing it

[unexp]

@unexp Send logs

Disregard... I forgot to mark /opt/python-i686-3.11.8/bin/python3.11 as executable :/

Otherwise, Millennium works fine now

[bbirchman]

Same bug. a complete reinstall of steam and millennium fixed it for me.