Hi, There's a thread with this same title, in this list, from august 2010. Link: <a href="https://www.redhat.com/archives/virt-tools-list/2010-August/msg00075.html">https://www.redhat.com/archives/virt-tools-list/2010-August/msg00075.html</a> I got this same problem. I'm running Ubuntu 10.04 x64. I made some tests with virt-manager 0.8.2, installed from ubuntu repositories, and then downloaded the newest virt-manager and virt-inst from virt-manager website. Compiled both sources as usual (opening INSTALL and following the instructions), but got that error when trying to launch virt-manager: <blockquote>Erro ao iniciar o Gerenciador de Máquina Virtual: virtinst version 0.500.1 is too old. virt-manager requires the python-virtinst library version 0.500.5 or greater. This can be downloaded at: <a href="http://virt-manager.org/download.html">http://virt-manager.org/download.html</a> Traceback (most recent call last): File "/usr/local/share/virt-manager/virt-manager.py", line 455, in <module> main() File "/usr/local/share/virt-manager/virt-manager.py", line 370, in main "\n\n" + msg) RuntimeError: virtinst version 0.500.1 is too old. virt-manager requires the python-virtinst library version 0.500.5 or greater. This can be downloaded at: <a href="http://virt-manager.org/download.html">http://virt-manager.org/download.html</a> </blockquote> The output of <pre>python -c 'import virtinst; print virtinst'</pre>command is: lamps@ubunteira:/opt/virtinst-0.500.5$ python -c 'import virtinst; print virtinst' <module 'virtinst' from 'virtinst/__init__.py'> and the output for <pre>sudo python setup.py install</pre>is: lamps@ubunteira:/opt/virtinst-0.500.5$ sudo python setup.py install [sudo] password for lamps: running install running build Building build/po/ja/virtinst.mo from ja.po Building build/po/it/virtinst.mo from it.po Building build/po/nl/virtinst.mo from nl.po Building build/po/ru/virtinst.mo from ru.po Building build/po/sr@latin/virtinst.mo from sr@latin.po Building build/po/es/virtinst.mo from es.po Building build/po/zh_CN/virtinst.mo from zh_CN.po Building build/po/sr/virtinst.mo from sr.po Building build/po/uk/virtinst.mo from uk.po Building build/po/fr/virtinst.mo from fr.po Building build/po/pt_BR/virtinst.mo from pt_BR.po Building build/po/pl/virtinst.mo from pl.po running build_py package init file 'virtconv/parsers/__init__.py' not found (or not a regular file) package init file 'virtconv/parsers/__init__.py' not found (or not a regular file) running build_scripts running install_lib copying build/lib.linux-x86_64-2.6/virtconv/__init__.py -> /usr/local/lib/python2.6/dist-packages/virtconv copying build/lib.linux-x86_64-2.6/virtinst/__init__.py -> /usr/local/lib/python2.6/dist-packages/virtinst byte-compiling /usr/local/lib/python2.6/dist-packages/virtconv/__init__.py to __init__.pyc byte-compiling /usr/local/lib/python2.6/dist-packages/virtinst/__init__.py to __init__.pyc running install_scripts changing mode of /usr/local/bin/virt-install to 755 changing mode of /usr/local/bin/virt-image to 755 changing mode of /usr/local/bin/virt-convert to 755 changing mode of /usr/local/bin/virt-clone to 755 running install_data Installing build/po/pl/virtinst.mo to share/locale/pl/LC_MESSAGES/ Installing build/po/pt_BR/virtinst.mo to share/locale/pt_BR/LC_MESSAGES/ Installing build/po/ja/virtinst.mo to share/locale/ja/LC_MESSAGES/ Installing build/po/sr/virtinst.mo to share/locale/sr/LC_MESSAGES/ Installing build/po/es/virtinst.mo to share/locale/es/LC_MESSAGES/ Installing build/po/uk/virtinst.mo to share/locale/uk/LC_MESSAGES/ Installing build/po/sr@latin/virtinst.mo to share/locale/sr@latin/LC_MESSAGES/ Installing build/po/nl/virtinst.mo to share/locale/nl/LC_MESSAGES/ Installing build/po/ru/virtinst.mo to share/locale/ru/LC_MESSAGES/ Installing build/po/zh_CN/virtinst.mo to share/locale/zh_CN/LC_MESSAGES/ Installing build/po/it/virtinst.mo to share/locale/it/LC_MESSAGES/ Installing build/po/fr/virtinst.mo to share/locale/fr/LC_MESSAGES/ copying build/po/pl/virtinst.mo -> /usr/local/share/locale/pl/LC_MESSAGES/ copying build/po/pt_BR/virtinst.mo -> /usr/local/share/locale/pt_BR/LC_MESSAGES/ copying build/po/ja/virtinst.mo -> /usr/local/share/locale/ja/LC_MESSAGES/ copying build/po/sr/virtinst.mo -> /usr/local/share/locale/sr/LC_MESSAGES/ copying build/po/es/virtinst.mo -> /usr/local/share/locale/es/LC_MESSAGES/ copying build/po/uk/virtinst.mo -> /usr/local/share/locale/uk/LC_MESSAGES/ copying build/po/sr@latin/virtinst.mo -> /usr/local/share/locale/sr@latin/LC_MESSAGES/ copying build/po/nl/virtinst.mo -> /usr/local/share/locale/nl/LC_MESSAGES/ copying build/po/ru/virtinst.mo -> /usr/local/share/locale/ru/LC_MESSAGES/ copying build/po/zh_CN/virtinst.mo -> /usr/local/share/locale/zh_CN/LC_MESSAGES/ copying build/po/it/virtinst.mo -> /usr/local/share/locale/it/LC_MESSAGES/ copying build/po/fr/virtinst.mo -> /usr/local/share/locale/fr/LC_MESSAGES/ running install_egg_info Removing /usr/local/lib/python2.6/dist-packages/virtinst-0.500.5.egg-info Writing /usr/local/lib/python2.6/dist-packages/virtinst-0.500.5.egg-info Does anybody have some hint about fixing this? Thanks in advance ;D