sudo apt-get install python-leveldb
+alternatively build yourself, see
+http://code.google.com/p/py-leveldb/
+and
+http://peter-hoffmann.com/2011/installation-leveldb-ubuntu-python.html
+make sure you have libtool, automake and pkg-config
+
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3. edit /etc/electrum.conf :
[leveldb]
path = /path/to/your/database
+pruning_limit = 10
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