sudo apt-get purge droidcam
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  aspectj bnd checkstyle esound-common gcc-4.8-base:i386 gcc-4.9-base:i386 gnome-video-effects groovy ivy junit4 kde-l10n-engb libaether-java
  libaopalliance-java libasm3-java libasound2:i386 libaspectj-java libass4 libasync-http-client-java libatinject-jsr330-api-java libbcpg-java
  libbcprov-java libbindex-java libboost-date-time1.54.0 libcdi-api-java libcglib-java libcgmanager0:i386 libclassworlds-java libcmis-0.4-4
  libcodenarc-groovy-java libcommons-beanutils-java libcommons-cli-java libcommons-codec-java libcommons-collections3-java
  libcommons-configuration-java libcommons-dbcp-java libcommons-digester-java libcommons-httpclient-java libcommons-jexl2-java
  libcommons-jxpath-java libcommons-lang-java libcommons-net2-java libcommons-pool-java libcommons-vfs-java libconstantine-java libdbus-1-3:i386
  libdoxia-java libdrm2:i386 libeasymock-java libecj-java libelf1:i386 libganymed-ssh2-java libgcrypt11:i386 libgdbm3:i386
  libgeronimo-interceptor-3.0-spec-java libgeronimo-jpa-2.0-spec-java libgeronimo-jta-1.1-spec-java libgeronimo-osgi-support-java
  libgmetrics-groovy-java libgnujaf-java libgoogle-gson-java libgradle-core-java libgradle-plugins-java libguava-java libguice-java
  libhamcrest-java libhawtjni-runtime-java libhttpclient-java libhttpcore-java libice6:i386 libidn11:i386 libinput0 libisl10 libitext1-java
  libjackrabbit-java libjaffl-java libjansi-java libjansi-native-java libjarjar-java libjatl-java libjavascriptcoregtk-1.0-0 libjbig0:i386
  libjcifs-java libjcip-annotations-java libjcommander-java libjetty-extra libjetty-extra-java libjetty-java libjffi-java libjffi-jni
  libjna-java libjnr-posix-java libjnr-x86asm-java libjsch-agent-proxy-java libjson-c2:i386 libjson0:i386 libjsoup-java libjsr305-java
  libkryo-java libkubuntu0 libllvm3.3 libllvm3.5 liblogback-java libmagick++5 libmagickcore5 libmagickcore5-extra libmagickwand5
  libmaven-ant-tasks-java libmaven-parent-java libmaven-scm-java libmaven2-core-java libmbim-glib0 libminlog-java libmirclient8driver-mesa
  libmircommon2 libmockobjects-java libmodello-java libmx4j-java libnative-platform-java libnative-platform-jni libnekohtml-java
  libnetbeans-cvsclient-java libnetty-java libnih-dbus1:i386 libnih1:i386 libnspr4:i386 libobjenesis-java libopenal1:i386
  libosgi-compendium-java libosgi-core-java libosgi-foundation-ee-java libplexus-ant-factory-java libplexus-archiver-java
  libplexus-bsh-factory-java libplexus-build-api-java libplexus-cipher-java libplexus-classworlds-java libplexus-classworlds2-java
  libplexus-cli-java libplexus-container-default-java libplexus-containers-java libplexus-containers1.5-java libplexus-i18n-java
  libplexus-interactivity-api-java libplexus-interpolation-java libplexus-io-java libplexus-sec-dispatcher-java libplexus-utils-java
  libplexus-utils2-java libpolyglot-maven-java libpoppler46 libprotobuf-lite8 libprotobuf8 libprotoc8 libqapt2 libqapt2-runtime libqdox-java
  libqt53d5-gles libreflectasm-java libservlet2.5-java libsisu-guice-java libsisu-ioc-java libslf4j-java libstdc++5:i386 libsystemd-journal0
  libsystemd-login0 libthumbnailer0 libtomcat7-java libtool-bin libts-0.0-0 libudev1:i386 libupstart1 libvala-0.24-0 libwagon-java
  libwagon2-java libwebkitgtk-1.0-0 libwebkitgtk-1.0-common libx11-xcb1:i386 libxbean-java libxstream-java libyaml-snake-java
  linux-headers-3.11.0-20 linux-headers-3.13.0-24 linux-headers-3.13.0-24-generic linux-headers-3.16.0-24 linux-headers-3.16.0-24-generic
  linux-image-3.16.0-24-generic linux-image-extra-3.16.0-24-generic maven testng tsconf valac-0.24 valac-0.24-vapi
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  droidcam*
0 upgraded, 0 newly installed, 1 to remove and 243 not upgraded.
1 not fully installed or removed.
After this operation, 1,529 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 487088 files and directories currently installed.)
Removing droidcam (1.3-0ubuntu0) ...
rmmod: ERROR: Module v4l2loopback_dc is not currently loaded
dpkg: error processing package droidcam (--purge):
 subprocess installed post-removal script returned error exit status 1
Processing triggers for desktop-file-utils (0.22-1ubuntu3) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu5) ...
Processing triggers for bamfdaemon (0.5.1+15.04.20150202-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for mime-support (3.58ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.14-0ubuntu1) ...
Errors were encountered while processing:
 droidcam
E: Sub-process /usr/bin/dpkg returned an error code (1)