I tried to manually update .NET and Jellyfin to latest versions and got this error:
Couldn't find a valid ICU package installed on the system. Please install libicu (or icu-libs) using your package manager and try again. Alternatively you can set the configuration flag System.Globalization.Invariant to true if you want
to run with no globalization support. Please see https://aka.ms/dotnet-missing-libicu for more information.
LibreELEC 13 (nightly)
.NET 10.0.12 (manually updated)
Jellyfin 12.0 (manually updated)
[LE13] .NET/Jellyfin: Couldn't find a valid ICU package installed on the system
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VoSed -
September 12, 2026 at 10:38 AM -
Thread is Resolved
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Are you running the latest nightly?
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I tried to manually update .NET and Jellyfin to latest versions and got this error:
Couldn't find a valid ICU package installed on the system. Please install libicu (or icu-libs) using your package manager and try again. Alternatively you can set the configuration flag System.Globalization.Invariant to true if you want
to run with no globalization support. Please see https://aka.ms/dotnet-missing-libicu for more information.
LibreELEC 13 (nightly)
.NET 10.0.12 (manually updated)
Jellyfin 12.0 (manually updated)The package build script copies the icu files. Have a look at https://github.com/LibreELEC/Libr…time/package.mk
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Are you running the latest nightly?
LibreELEC (community): nightly-20260910-90a0f92 (RPi5.aarch64) -
The package build script copies the icu files. Have a look at https://github.com/LibreELEC/Libr…time/package.mk
Thank you! Problem solved!
