http://stackoverflow.com/questions/17181073/ubuntu-12-04-libudev-dev-wont-install-because-of-dependencies
//被依賴的libudev1是11.2版本 $ dpkg -l libudev1 Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-=========================================-=========================-=========================-======================================================================================== ii libudev1:amd64 198-0ubuntu11.2 amd64 libudev shared library ii libudev1:i386 198-0ubuntu11.2 i386 libudev shared library //要安裝libudev-dev這個包 zhangze@zhangze-OptiPlex-7010:/var/cache$ apt-cache search libudev-dev libudev-dev - libudev development files zhangze@zhangze-OptiPlex-7010:/var/cache$ dpkg -l libudev-dev dpkg-query: no packages found matching libudev-dev //安裝顯示依賴不滿足 zhangze@zhangze-OptiPlex-7010:/var/cache$ sudo apt-get install libudev-dev Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libudev-dev : Depends: libudev1 (= 198-0ubuntu11) but 198-0ubuntu11.2 is to be installed E: Unable to correct problems, you have held broken packages.
安裝libudev-dev，顯示依賴於共享庫libudev1，而版本(= 198-0ubuntu11)指的是當前要安裝包libudev-dev的版本是11，但是應該安裝的是11.2這個版本，
因此是要安裝的libudev-dev所在倉庫版本太老，而不是已安裝的libudev1版本老。
去http://packages.ubuntu.com/搜索libudev-dev這個包，發現它是在security這部分中的，而系統的security開關被關閉，已經很久沒有更新security的包了
因此在software & update中打開security update，再次apt-get install libudev-dev成功（也可以vim /etc/apt/sources.list添加security源）
安裝完以后的最終結果是兩個包全部更新到11.2版本，說明之前的問題是：libudev1已經在最新的11.2版本，
而要安裝的libudev-dev在原來的倉庫中是老版本11的，老版本不能依賴於新版本，添加security倉庫，下載的是最新版本的libudev-dev包
zhangze@zhangze-OptiPlex-7010:/var/cache$ dpkg -l libudev-dev Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-=========================================-=========================-=========================-======================================================================================== ii libudev-dev 198-0ubuntu11.2 amd64 libudev development files zhangze@zhangze-OptiPlex-7010:/var/cache$ dpkg -l libudev1 Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-=========================================-=========================-=========================-======================================================================================== ii libudev1:amd64 198-0ubuntu11.2 amd64 libudev shared library ii libudev1:i386 198-0ubuntu11.2 i386 libudev shared library