Ubuntu Xenial 16.04.3 não pode atualizar

Question

Eu sou novo neste fórum. Eu não posso atualizar o meu ubuntu Xenial 16.04 em execução no meu pi framboesa 3. Eu executei os seguintes comandos:

sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade

Os resultados são os seguintes. Esta questão está me assombrando por alguns dias. Por favor, me ajude se puder. Muito obrigado!

Do you want to continue? [Y/n] Y
Setting up python3.5-minimal (3.5.2-2ubuntu0~16.04.3) ...
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes
Sorry: ValueError: source code string cannot contain null bytes

dpkg: error processing package python3.5-minimal (--configure):
subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of python3.5:
python3.5 depends on python3.5-minimal (= 3.5.2-2ubuntu0~16.04.3);
however: Package python3.5-minimal is not configured yet.

dpkg: error processing package python3.5 (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of idle-python3.5:
idle-python3.5 depends on python3.5;
however: Package python3.5 is not configured yet.

dpkg: error processing package idle-python3.5 (--configure):
dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
No apport report written because the error message indicates its a followup error from a previous failure.
No apport report written because MaxReports is reached already
dpkg: dependency problems prevent configuration of python3.5-dev:
python3.5-dev depends on python3.5 (= 3.5.2-2ubuntu0~16.04.3);
however: Package python3.5 is not configured yet.

dpkg: error processing package python3.5-dev (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
python3.5-minimal
python3.5
idle-python3.5
python3.5-dev
E: Sub-process /usr/bin/dpkg returned an error code (1)