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sudo apt-get install python-lxml

Reading package lists... Done

Building dependency tree      

Reading state information... Done

python-lxml is already the newest version.

python-lxml set to manually installed.

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

grek@dell-3147:~$ /opt/extras.ubuntu.com/picapy/bin/picapy

Traceback (most recent call last):

  File "/opt/extras.ubuntu.com/picapy/bin/picapy", line 38, in <module>

    from picapy import Picapy

  File "/opt/extras.ubuntu.com/picapy/share/picapy/picapy.py", line 41, in <module>

    import googlepicasaapi

  File "/opt/extras.ubuntu.com/picapy/share/picapy/googlepicasaapi.py", line 41, in <module>

    from lxml import etree

ImportError: No module named 'lxml'