Eu fiz o upgrade do Trusty para o Xenial seguindo o passo a passo proposto pelo Ubuntu, mas não consegui instalar o QGIS LTR novamente (seguindo as instruções do qgis.org que eu estou acostumado, tendo instalado o qgis em muitos computadores do Ubuntu), sendo bloqueado por dois pacotes quebrados. Tentei sudo autoremove e purgar com terminal, e se Synaptic imediatamente os detecta como sendo quebrado, não pode removê-los. Aqui estão os detalhes fornecidos pelo Synaptic:
(Reading database ... 248305 files and directories currently installed.)
Removing python-qgis-common (1:2.14.5+24xenial) ...
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
ImportError: No module named site
dpkg: error processing package python-qgis-common (--remove):
subprocess installed pre-removal script returned error exit status 1
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
ImportError: No module named site
dpkg: error while cleaning up:
subprocess installed post-installation script returned error exit status 1
dpkg: python-matplotlib: dependency problems, but removing anyway as you requested:
python-qgis-common depends on python-matplotlib.
Removing python-matplotlib (1.5.1-1ubuntu1) ...
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
ImportError: No module named site
dpkg: error processing package python-matplotlib (--remove):
subprocess installed pre-removal script returned error exit status 1
Errors were encountered while processing:
python-qgis-common
python-matplotlib
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover: