我执行了
sudo apt-get update
sudo apt-get install openjdk-7-jre
并且软件包似乎已干净安装，但 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/ 除了程序 policytool 之外是空的
我也安装了 openjdk-7-jdk，并且 /usr/lib/jvm/java-7-openjdk-amd64/bin/ 已正确填充，但 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/ 仍然是空的。
所以现在我处于这样的状态：我有 javac、jar、javadoc 等，但没有 java
$ ls /usr/lib/jvm/java-7-openjdk-amd64/jre/bin
policytool*
$ find /usr/lib/jvm/java-7-openjdk-amd64/ -name java -print
$
dpkg -L openjdk-7-jre表示包中没有 java 可执行文件。dpkg -S /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java表示它应该到達。
我是否损坏了某个数据库？我该如何修复它？
我已经尝试了一些显而易见的方法，例如在软件源中禁用 ppas、执行apt-get clean和apt-get update等等apt-get purge openjdk-7-jre。
更新：我执行了以下命令：
$ which java
/usr/bin/java
$ java -version
java version "1.7.0_80"
$ ls -l /usr/bin/java
/usr/bin/java -> /etc/alternatives/java
$ ls -l /etc/alternatives/java
/etc/alternatives/java -> /usr/lib/jvm/java-7-oracle/jre/bin/java
这一切都很好，但是我需要运行 openjdk 7，而不是 Oracle 版本。我正在构建 Android，构建系统已锁定到特定版本。
这一切都正常，直到昨天一个sudo update-alternatives --config java命令出错了，我尝试卸载并重新安装 openjdk7 包，但无法正确重新安装。
答案1
您正在寻找的文件不在 中openjdk-7-jre；它们在 中openjdk-7-jre-headless。
该openjdk-7-jre-headless软件包安装以下文件列表（来自 Ubuntu 15.10 amd64 安装）：
/.
/usr
/usr/lib
/usr/lib/jvm
/usr/lib/jvm/.java-1.7.0-openjdk-amd64.jinfo
/usr/lib/jvm/java-7-openjdk-amd64
/usr/lib/jvm/java-7-openjdk-amd64/man
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1
/usr/lib/jvm/java-7-openjdk-amd64/man/man1
/usr/lib/jvm/java-7-openjdk-amd64/jre
/usr/lib/jvm/java-7-openjdk-amd64/jre/man
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/rmiregistry.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/pack200.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/keytool.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/orbd.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/rmid.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/servertool.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/unpack200.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/tnameserv.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja_JP.UTF-8/man1/java.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/rmiregistry.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/pack200.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/keytool.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/orbd.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/rmid.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/servertool.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/unpack200.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/tnameserv.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/java.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/THIRD_PARTY_README
/usr/lib/jvm/java-7-openjdk-amd64/jre/ASSEMBLY_EXCEPTION
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/rt.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/currency.data
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors/motif_LinkDrop32x32.gif
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors/motif_MoveNoDrop32x32.gif
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors/motif_LinkNoDrop32x32.gif
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors/motif_MoveDrop32x32.gif
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors/motif_CopyNoDrop32x32.gif
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors/invalid32x32.gif
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors/motif_CopyDrop32x32.gif
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/jvm.hprof.txt
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/javazic.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/classlist
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/management-agent.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/security
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/security/US_export_policy.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/security/local_policy.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/jsse.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/jce.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/cmm
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/cmm/PYCC.pf
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/cmm/LINEAR_RGB.pf
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/cmm/sRGB.pf
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/cmm/GRAY.pf
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/cmm/CIEXYZ.pf
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libinstrument.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libj2krb5.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/headless
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/headless/libmawt.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/Xusage.txt
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjawt.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjsdt.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libunpack.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libawt.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libicedtea-sound.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libnpt.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libhprof.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjsound.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libj2gss.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjaas_unix.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libzip.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libnio.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjavalcms.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libverify.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libj2pcsc.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libmanagement.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libmlib_image.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/jli
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/jli/libjli.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libsaproc.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libdt_socket.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjava.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libsctp.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libnet.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libattach.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjavajpeg.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/jvm.cfg-default
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libj2pkcs11.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjava_crw_demo.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjsig.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjdwp.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libfontmanager.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/management
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/resources.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/ext
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/ext/icedtea-sound.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/ext/zipfs.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/ext/sunjce_provider.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/ext/sunpkcs11.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/ext/dnsns.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/ext/localedata.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/meta-index
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/jar.binfmt
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/rhino.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/jexec
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/compilefontconfig.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/charsets.jar
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/orbd
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/pack200
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/keytool
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/rmiregistry
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/tnameserv
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/rmid
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/servertool
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/unpack200
/usr/lib/jvm/java-7-openjdk-amd64/bin
/usr/lib/jvm/java-7-openjdk-amd64/bin/java-rmi.cgi
/usr/share
/usr/share/doc
/usr/share/doc/openjdk-7-jre-headless
/usr/share/doc/openjdk-7-jre-headless/JAVA_HOME
/usr/share/doc/openjdk-7-jre-headless/NEWS.IcedTea.gz
/usr/share/doc/openjdk-7-jre-headless/README.alternatives
/usr/share/doc/openjdk-7-jre-headless/AUTHORS.IcedTea
/usr/share/doc/openjdk-7-jre-headless/copyright
/usr/share/doc/openjdk-7-jre-headless/changelog.Debian.gz
/usr/share/doc/openjdk-7-jre-headless/README.Debian
/usr/share/doc/openjdk-7-jre-headless/README.IcedTea.gz
/usr/share/binfmts
/usr/share/lintian
/usr/share/lintian/overrides
/usr/share/lintian/overrides/openjdk-7-jre-headless
/etc
/etc/java-7-openjdk
/etc/java-7-openjdk/fontconfig.properties
/etc/java-7-openjdk/images
/etc/java-7-openjdk/images/cursors
/etc/java-7-openjdk/images/cursors/cursors.properties
/etc/java-7-openjdk/sound.properties
/etc/java-7-openjdk/logging.properties
/etc/java-7-openjdk/jvm-amd64.cfg
/etc/java-7-openjdk/accessibility.properties
/etc/java-7-openjdk/net.properties
/etc/java-7-openjdk/swing.properties
/etc/java-7-openjdk/tz.properties
/etc/java-7-openjdk/calendars.properties
/etc/java-7-openjdk/flavormap.properties
/etc/java-7-openjdk/psfontj2d.properties
/etc/java-7-openjdk/security
/etc/java-7-openjdk/security/nss.cfg
/etc/java-7-openjdk/security/java.policy
/etc/java-7-openjdk/security/java.security
/etc/java-7-openjdk/management
/etc/java-7-openjdk/management/jmxremote.password
/etc/java-7-openjdk/management/management.properties
/etc/java-7-openjdk/management/jmxremote.access
/etc/java-7-openjdk/management/snmp.acl
/etc/java-7-openjdk/content-types.properties
/etc/java-7-openjdk/psfont.properties.ja
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/rmiregistry.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/pack200.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/keytool.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/orbd.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/rmid.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/servertool.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/unpack200.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/tnameserv.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja_JP.UTF-8/man1/java.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/ja
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/rmiregistry.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/pack200.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/keytool.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/orbd.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/rmid.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/servertool.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/unpack200.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/tnameserv.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/man/man1/java.1.gz
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/ja
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/fontconfig.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/images/cursors/cursors.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/sound.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/logging.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/accessibility.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/net.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/swing.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/tz.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/calendars.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/flavormap.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/psfontj2d.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/security/nss.cfg
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/security/cacerts
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/security/java.policy
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/security/java.security
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/jvm.cfg
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjsig.so
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/management/jmxremote.password
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/management/management.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/management/jmxremote.access
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/management/snmp.acl
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/content-types.properties
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/psfont.properties.ja
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/zi
/usr/lib/jvm/java-7-openjdk-amd64/docs
/usr/lib/jvm/java-7-openjdk-amd64/bin/orbd
/usr/lib/jvm/java-7-openjdk-amd64/bin/pack200
/usr/lib/jvm/java-7-openjdk-amd64/bin/keytool
/usr/lib/jvm/java-7-openjdk-amd64/bin/java
/usr/lib/jvm/java-7-openjdk-amd64/bin/rmiregistry
/usr/lib/jvm/java-7-openjdk-amd64/bin/tnameserv
/usr/lib/jvm/java-7-openjdk-amd64/bin/rmid
/usr/lib/jvm/java-7-openjdk-amd64/bin/servertool
/usr/lib/jvm/java-7-openjdk-amd64/bin/unpack200
/usr/lib/jvm/java-1.7.0-openjdk-amd64