Before stopping the container, I checked the locale:

```bash
root@526a88b1e27b:~/ros2_ws# locale
LANG=
LANGUAGE=
LC_CTYPE="POSIX"
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=
```

You are correct it was the problem of my environment variables. Set it according to your instructions and checked locale again:

```bash
root@526a88b1e27b:~/ros2_ws# locale
LANG=en_US.UTF-8
LANGUAGE=en_US:en
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8
```
Compiling perfectly now. I thought this step `update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8` in the [install instructions](https://github.com/ros2/ros2/wiki/Linux-Development-Setup) would have worked inside the container - but it did not. 

Thanks a lot @marguedas  for pointing out your dockerfiles, saves me a lot of trouble!





---
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