Upgrade Plone 5.0.7 to 5.1.0 fails

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Now we're getting somewhere!

First I installed all packages:

apt-get install python2.7 python2.7-dev build-essential libssl-dev libxml2-dev libz-dev libjpeg-dev libreadline-dev libxslt-dev python-dev

libz-dev was missing!

Then I ran sudo -u plone_buildout bin/buildout again:

Updating instance.
Updating repozo.
Updating backup.
Updating zopepy.
Updating unifiedinstaller.
Updating precompiler.
Compiling Python files.
  File "/opt/plone/buildout-cache/eggs/zodbpickle-0.7.0-py2.7-linux-x86_64.egg/zodbpickle/pickletools_3.py", line 2049
    print("%5d:" % pos, end=' ', file=out)
                           ^
SyntaxError: invalid syntax

  File "/opt/plone/buildout-cache/eggs/zodbpickle-0.7.0-py2.7-linux-x86_64.egg/zodbpickle/pickle_3.py", line 178
    def __init__(self, file, protocol=None, *, fix_imports=True):
                                             ^
SyntaxError: invalid syntax

  File "/opt/plone/buildout-cache/eggs/zodbpickle-0.7.0-py2.7-linux-x86_64.egg/zodbpickle/tests/pickletester_3.py", line 145
    class use_metaclass(object, metaclass=metaclass):
                                         ^
SyntaxError: invalid syntax

Compiling locale files.
Error while compiling /opt/plone/buildout-cache/eggs/python_gettext-3.0-py2.7.egg/pythongettext/tests/test_escape.po
Error while compiling /opt/plone/buildout-cache/eggs/python_gettext-3.0-py2.7.egg/pythongettext/tests/test5.po
Updating setpermissions.
setpermissions: Running # Dummy references to force this to execute after referenced parts
echo /opt/plone/zinstance/var/backups yes > /dev/null
chmod 600 .installed.cfg
# Make sure anything we've created in var is r/w by our group
find /opt/plone/zinstance/var -type d -exec chmod 770 {} \; 2> /dev/null
find /opt/plone/zinstance/var -type f -exec chmod 660 {} \; 2> /dev/null
find /opt/plone/zinstance/var -type d -exec chmod 770 {} \; 2> /dev/null
find /opt/plone/zinstance/var -type f -exec chmod 660 {} \; 2> /dev/null
chmod 754 /opt/plone/zinstance/bin/*
Versions had to be automatically picked.
The following part definition lists the versions picked:
[versions]
plone.recipe.command = 1.1
plone.recipe.precompiler = 0.6

I had these SyntaxErrors as well when I started the upgrade. However, the site seems to function. So, can I ignore those errors?

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