On 30/10/2019 12:11, Arno Steffens wrote:
I use a poky core-image-minimal with some packages added - as for instance 
strace and valgrind (for armv7a).
Strange - yocto in older versions generates images with valgrind/strace .. 
without any complaints.
So both PC and image-recipe are same, but in Yocto 2.5 and 2.7 it works, in 3.0 
not ?!?

Sorry I am confused, do you mean python is missing in requested image or at 
host PC with Ubuntu 1804? If it is missing in image,
shouldn't it be included by dependencies automatically?

At UbuntuPC python 2.7 is installed:
python
Python 2.7.15+ (default, Oct 7 2019, 17:39:04)
[GCC 7.4.0] on linux2

I mean the host, as that's running code using the host python during the build.

Try this:

$ python3 -m distutils.sysconfig

If that does nothing then your Python is working. If it fails then you need to install the full Python 3 on your machine, not just minimal.

Ross
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