如何删除openjdk-7？
我想卸载java 7并安装版本6（因为我想使用的一些程序与7不兼容）。
我试过了 ：
$ sudo apt-get remove openjdk-7-jre [sudo] password for USER: 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: libatk-wrapper-java-jni : Depends: libatk-wrapper-java (>= 0.30.4-0ubuntu4) but it is not going to be installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages. $ sudo dpkg -r openjdk-7-jre dpkg: dependency problems prevent removal of openjdk-7-jre:amd64: default-jre depends on openjdk-7-jre (>= 7~u3-2.1). icedtea-7-plugin:amd64 depends on openjdk-7-jre. icedtea-netx:amd64 depends on openjdk-6-jre (>= 6b23~pre10~) | openjdk-7-jre; however: Package openjdk-6-jre is not installed. Package openjdk-7-jre:amd64 is to be removed. openjdk-7-jdk:amd64 depends on openjdk-7-jre (= 7u15-2.3.7-0ubuntu1~12.10). dpkg: error processing openjdk-7-jre:amd64 (--remove): dependency problems - not removing Errors were encountered while processing: openjdk-7-jre:amd64 $ dpkg -l | grep icedtea ii icedtea-7-jre-jamvm:amd64 7u15-2.3.7-0ubuntu1~12.10 amd64 Alternative JVM for OpenJDK, using JamVM ii icedtea-7-plugin:amd64 1.3-1ubuntu1.1 amd64 web browser plugin based on OpenJDK and IcedTea to execute Java applets ii icedtea-netx:amd64 1.3-1ubuntu1.1 amd64 NetX - implementation of the Java Network Launching Protocol (JNLP) ii icedtea-netx-common 1.3-1ubuntu1.1 all NetX - implementation of the Java Network Launching Protocol (JNLP) monkey@ICANSEEYOU:~$ dpkg -l | grep jre ii default-jre 1:1.7-43ubuntu3 amd64 Standard Java or Java compatible Runtime ii default-jre-headless 1:1.7-43ubuntu3 amd64 Standard Java or Java compatible Runtime (headless) ii icedtea-7-jre-jamvm:amd64 7u15-2.3.7-0ubuntu1~12.10 amd64 Alternative JVM for OpenJDK, using JamVM ri openjdk-7-jre:amd64 7u15-2.3.7-0ubuntu1~12.10 amd64 OpenJDK Java runtime, using Hotspot JIT ii openjdk-7-jre-headless:amd64 7u15-2.3.7-0ubuntu1~12.10 amd64 OpenJDK Java runtime, using Hotspot JIT (headless) ii openjdk-7-jre-lib 7u15-2.3.7-0ubuntu1~12.10 all OpenJDK Java runtime (architecture independent libraries) 在删除oracle java之前，必须选择另一个实现来提供java。 使用sudo update-alternatives --config java
然后你应该能够删除它。 或者你可以保留它，因为它不应该在那时使用。
我想你使用的是12.10或13.04。 这里default-jre取决于openjdk-7-jre。 所以你不能删除openjdk-7而不删除default-jre并打破很多其他依赖项。
但是在openjdk-7下安装openjdk-6没问题。
您现在可以尝试配置有问题的应用程序以使用正确的jdk或使用update-alternatives命令更改默认jre。 这是这个任务的小帮手：
function updateDefaultJava() { local pkgArch case $(arch) in x86_64) pkgArch=amd64;; i686) pkgArch=i386;; *) echo "unhandled architecture $(arch)"; return 1;; esac local javaBase=/usr/lib/jvm/java-6-openjdk-${pkgArch} local cmd for cmd in jre/bin/java jre/bin/javaws do local c=$(basename ${cmd}) update-alternatives --set ${c} ${javaBase}/${cmd} || let retC+=$? done done exit ${retC} } updateDefaultJava