Bug 508626 - Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8. QT depends on UTF-8 locale, and has switched to "C,UTF-8" instead. If this causes problems, reconfigure your locale. See locale(1) manual for more information. plasma-mobile
Summary: Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UT...
Status: REPORTED
Alias: None
Product: plasma-mobile
Classification: Plasma
Component: general (other bugs)
Version First Reported In: unspecified
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Plasma Mobile Bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-08-23 06:06 UTC by txl01867
Modified: 2025-08-23 06:06 UTC (History)
1 user (show)

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Description txl01867 2025-08-23 06:06:19 UTC 
Hello everyone!
    I am running Mobian 20250803 with KDE Plasma on the Librem 5 Evergreen.
The following error regularly appears on the device:

```
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
QT depends on UTF-8 locale, and has switched to "C,UTF-8" instead.
If this causes problems, reconfigure your locale. See locale(1) manual for more information.
plasma-mobile-envmanager: Checking and applying mobile configuration...
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
QT depends on UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual for more information.
```

Here is some downstream discussion on the Purism forum:
https://forums.puri.sm/t/power-button-unresponsiveness-running-kde-plasma-mobian-20250803/28823

Here is additional discussion on the Unix StackExchange:
https://unix.stackexchange.com/questions/799044/how-can-i-resolve-this-error-detected-locale-c-with-character-encoding-ansi

The error at least appears to be persistent after changing the language in the settings application.