Attempting to remove the package with "apt remove rxvt" also fails
WARNING: apt does not have a stable CLI interface. Use with caution in scripts. Reading package lists... Building dependency tree... Reading state information... The following packages were automatically installed and are no longer required: bridge-utils ebtables fonts-roboto-hinted fp-compiler-3.0.0 fp-docs-3.0.0 fp-ide-3.0.0 fp-units-base-3.0.0 fp-units-db-3.0.0 fp-units-fcl-3.0.0 fp-units-fv-3.0.0 fp-units-gfx-3.0.0 fp-units-gtk2-3.0.0 fp-units-math-3.0.0 fp-units-misc-3.0.0 fp-units-multimedia-3.0.0 fp-units-net-3.0.0 fp-units-rtl-3.0.0 fp-utils-3.0.0 fpc-3.0.0 fpc-source-3.0.0 fwupdate fwupdate-amd64-signed gcj-6-jre-lib gconf-service gconf2 gconf2-common gir1.2-appstreamglib-1.0 gir1.2-gusb-1.0 glassfish-jmac-api gnome-mime-data guile-2.0-libs gvfs-bin libann0 libapparmor-perl libappindicator1 libappstream-glib8 libart-2.0-2 libass5 libavdevice57 libavfilter6 libavformat57 libavresample3 libbabeltrace-ctf1 libbind9-140 libblas-common libbluray1 libbonobo2-0 libbonobo2-common libbonoboui2-0 libbonoboui2-common libboost-date-time1.62.0 libboost-filesystem1.62.0 libboost-iostreams1.62.0 libboost-program-options1.62.0 libboost-random1.62.0 libboost-regex1.67.0 libboost-system1.62.0 libboost-thread1.62.0 libc++1 libc++1-7 libc++abi1-7 libcdio-cdda1 libcdio-paranoia1 libcdio13 libclassworlds-java libcommons-dbcp-java libcommons-pool-java libdbusmenu-gtk4 libdns162 libdoxia-core-java libeasymock-java libebitdo1 libebur128-1 libecj-java libeclipse-aether-java libevent-2.0-5 libfile-copy-recursive-perl libfile-slurp-perl libfile-slurp-tiny-perl libfile-slurp-unicode-perl libfm-data libfm-gtk-data libfm-gtk4 libfm-modules libfm4 libfwup1 libfwupd1 libgcj-bc libgcj-common libgcj17 libgconf-2-4 libgcr-3-common libgegl-0.3-0 libgeronimo-ejb-3.2-spec-java libgeronimo-jms-1.1-spec-java libgeronimo-validation-1.0-spec-java libgfortran3 libgles2-mesa libglew2.0 libgltf-0.0-0v5 libgnome-2-0 libgnome-desktop-3-12 libgnome-keyring-common libgnome-keyring0 libgnome2-common libgnomecanvas2-0 libgnomecanvas2-common libgnomeui-0 libgnomeui-common libgnomevfs2-0 libgnomevfs2-common libgnomevfs2-extra libgutenprint2 libhunspell-1.4-0 libical2 libilmbase12 libindicator7 libisc160 libisccc140 libisccfg140 libjemalloc1 libjetty9-extra-java libjffi-java libjffi-jni libjnr-constants-java libjnr-enxio-java libjnr-ffi-java libjnr-posix-java libjnr-unixsocket-java libjnr-x86asm-java libjs-node-uuid liblivemedia57 liblouis12 liblouisutdml7 liblwres141 libmagick++-6.q16-7 libmagickcore-6.q16-3 libmagickwand-6.q16-3 libmaven-archiver-java libmaven2-core-java libminiupnpc10 libnetty-3.9-java libnfs8 libntfs-3g871 libopencv-calib3d2.4v5 libopencv-core2.4v5 libopencv-features2d2.4v5 libopencv-flann2.4v5 libopencv-highgui2.4-deb0 libopencv-imgproc2.4v5 libopencv-objdetect2.4v5 libopencv-video2.4v5 libopenexr22 liborbit-2-0 liborcus-0.11-0 libpackage-deprecationmanager-perl libperl5.24 libplexus-ant-factory-java libplexus-bsh-factory-java libplexus-classworlds2-java libplexus-cli-java libplexus-component-metadata-java libplexus-containers1.5-java libplexus-interactivity-api-java libpodofo0.9.4 libpoppler-qt4-4 libpoppler64 libpostproc54 libprotobuf-lite10 libpython3.5 libpython3.5-dev libqdox2-java libqpdf17 libqrencode3 libqt5clucene5 libradare2-1.1 librados2 libraw15 librbd1 libre2-3 libreoffice-ogltrans libreoffice-pdfimport libsac-java-gcj libsane-extras libsane-extras-common libsbsms10 libsndio6.1 libsodium18 libspring-aop-java libspring-beans-java libspring-context-java libspring-core-java libspring-expression-java libspring-instrument-java libsrtp0 libsuitesparseconfig4 libswscale4 libsynctex1 libtaglibs-standard-impl-java libtaglibs-standard-spec-java libtiff5-dev libtinfo-dev libtinyxml2-4 libtomcat8-java libtxc-dxtn-s2tc libunbound2 libupnp6 libva-wayland1 libwagon-ftp-java libwagon-http-shaded-java libwagon-java libwayland-egl1-mesa libx86emu1 libxbean-java libxcb-dpms0 libxen-4.8 libxfont1 libxmltok1 linux-headers-4.19.0-0.bpo.2-amd64 linux-headers-4.19.0-0.bpo.2-common linux-image-4.19.0-0.bpo.2-amd64 lxmenu-data node-cross-spawn-async node-fstream node-pseudomap prosper python-beautifulsoup python-debian python-ipaddr python-libvirt python3-pyasn1 python3.5 python3.5-dev python3.5-minimal qpdf rename ruby2.3 ruby2.3-dev texlive-generic-extra texlive-htmlxml texlive-lang-african texlive-lang-indic texlive-omega texlive-plain-extra ttf-adf-accanthis ttf-adf-gillius ttf-adf-universalis x11proto-dri2-dev x11proto-gl-dev Use 'sudo apt autoremove' to remove them. The following packages will be REMOVED: rxvt 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded. 2882 not fully installed or removed. After this operation, 620 kB disk space will be freed. Do you want to continue? [Y/n] apt-listchanges: Can't set locale; make sure $LC_* and $LANG are correct! perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). locale: Cannot set LC_ALL to default locale: No such file or directory (Reading database ... 580996 files and directories currently installed.) Removing rxvt (1:2.7.10-7+b1) ... Unable to open file "/menu.h". install-menu: /etc/menu-methods/rxvt: aborting dpkg: error processing package rxvt (--remove): installed rxvt package post-removal script subprocess returned error exit status 1 Errors were encountered while processing: rxvt E: Sub-process /usr/bin/dpkg returned an error code (1)