添加源deb http://www.fyma.ucl.ac.be/ubuntu gutsy contrib安裝OOoLatex出錯，於是使用sudo dpkg --purge --force-remove-reinstreq ooolatex強制刪除，也出錯：
dpkg - warning, overriding problem because --force enabled:
Package is in a very bad inconsistent state - you should
reinstall it before attempting a removal.
(Reading database ... 242056 files and directories currently installed.)
Removing ooolatex ...
sed: can't read /usr/lib/openoffice/share/config/soffice.cfg/modules/simpress/accelerator/default.xml/default.xml: Not a directory
dpkg: error processing ooolatex (--purge):
subprocess post-removal script returned error exit status 2
Errors were encountered while processing:
ooolatex
解決辦法：
1.刪除文件 /usr/lib/openoffice/share/config/soffice.cfg/modules/simpress/accelerator/default.xml（default.xml可以先移到別的地方，刪完後再移回）;
2.執行sudo dpkg --purge --force-remove-reinstreq ooolatex