On my system "dnf autoremove" shows only one package which potentially can be removed: # dnf autoremove Last metadata expiration check: 1:01:59 ago on Fri 13 Apr 2018 05:44:21 BST. Dependencies resolved. ========================================================================================================================================================================= Package Arch Version Repository Size ========================================================================================================================================================================= Removing: os-prober x86_64 1.74-6.fc28 @rawhide 104 k Transaction Summary ========================================================================================================================================================================= Remove 1 Package Freed space: 104 k However when I'm trying to check list of the packages which are not required by any other packages list is way longer and at least some of those packages really make sense to remove. Cannot find description of the rules used by dnf to classify exact package as potentially removable. # for i in $(rpm -qa | sort); do if [ "$(rpm -e --test $i 2>&1)" == "" ]; then echo $i; fi; done abrt-cli-2.10.8-2.fc29.x86_64 acl-2.2.52-21.fc29.x86_64 acpi-1.7-9.fc28.x86_64 acpid-2.0.28-7.fc28.x86_64 acpitool-0.5.1-16.fc28.x86_64 alacarte-3.11.91-10.fc28.noarch alsa-plugins-pulseaudio-1.1.6-2.fc29.x86_64 aspell-devel-0.60.6.1-21.fc29.x86_64 aspell-en-2017.08.24-2.fc28.x86_64 aspell-pl-6.0_20061121-17.fc28.x86_64 atmel-firmware-1.3-18.fc28.noarch attr-2.4.47-23.fc28.x86_64 audit-libs-devel-2.8.3-3.fc29.x86_64 autofs-5.1.4-16.fc29.x86_64 avahi-gobject-devel-0.7-12.fc29.x86_64 basesystem-11-5.fc28.noarch bash-completion-2.7-4.fc29.noarch bind-chroot-9.11.3-7.fc29.x86_64 bind-utils-9.11.3-7.fc29.x86_64 binutils-devel-2.30-14.fc29.x86_64 biosdevname-0.7.3-1.fc29.x86_64 bison-3.0.4-9.fc28.x86_64 btrfs-progs-devel-4.16-2.fc29.x86_64 byacc-1.9.20170709-4.fc28.x86_64 cheese-3.28.0-1.fc29.x86_64 chrony-3.3-1.fc29.x86_64 cifs-utils-6.8-1.fc29.x86_64 cjkuni-uming-fonts-0.2.20080216.1-60.fc28.noarch clang-devel-6.0.0-5.fc29.x86_64 clinfo-2.2.17.10.25-2.fc28.x86_64 colord-devel-1.4.2-1.fc29.x86_64 community-mysql-devel-5.7.21-6.fc29.x86_64 community-mysql-server-5.7.21-6.fc29.x86_64 compiler-rt-6.0.0-2.fc29.x86_64 cracklib-dicts-2.9.6-13.fc29.x86_64 crash-7.2.1-2.fc29.x86_64 cryptopp-6.1.0-2.fc29.x86_64 cryptsetup-2.0.2-2.fc29.x86_64 cscope-15.8b-7.fc28.x86_64 csmock-2.1.0-2.fc28.noarch cu-1.07-55.fc29.x86_64 cups-devel-2.2.7-1.fc29.x86_64 cups-filesystem-2.2.7-1.fc29.noarch cvs-1.11.23-46.fc28.x86_64 cyrus-sasl-lib-debuginfo-2.1.27-0.1rc7.fc29.x86_64 cyrus-sasl-md5-2.1.27-0.1rc7.fc29.x86_64 cyrus-sasl-plain-2.1.27-0.1rc7.fc29.x86_64 cyrus-sasl-scram-2.1.27-0.1rc7.fc29.x86_64 dconf-devel-0.28.0-1.fc29.x86_64 dconf-editor-3.28.0-1.fc29.x86_64 dejagnu-1.6.1-2.fc28.noarch dejavu-sans-fonts-2.35-6.fc28.noarch dejavu-serif-fonts-2.35-6.fc28.noarch 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flac-devel-1.3.2-6.fc28.x86_64 flute-1.3.0-18.OOo31.fc28.noarch folks-devel-0.11.4-5.fc28.x86_64 fontpackages-devel-1.44-20.fc28.noarch fpaste-0.3.9.1-3.fc28.noarch fprintd-pam-0.8.0-3.fc28.x86_64 fuse-devel-2.9.7-12.fc29.x86_64 gcc-gdb-plugin-8.0.1-0.21.fc29.x86_64 gc-devel-7.6.4-3.fc29.x86_64 GConf2-devel-3.2.6-20.fc29.x86_64 gdb-8.1-14.fc29.x86_64 gd-devel-2.2.5-3.fc29.x86_64 gedit-3.28.1-1.fc29.x86_64 genisoimage-1.1.11-38.fc28.x86_64 geoclue2-devel-2.4.7-4.fc28.x86_64 GeoIP-devel-1.6.12-3.fc28.x86_64 ghostscript-core-9.23-1.fc29.x86_64 ghostscript-x11-9.23-1.fc29.x86_64 gimp-data-extras-2.0.2-17.fc28.noarch gjs-devel-1.52.1-1.fc29.x86_64 glibc-all-langpacks-2.27.9000-14.fc29.x86_64 glibc-langpack-en-2.27.9000-14.fc29.x86_64 glibc-langpack-pl-2.27.9000-14.fc29.x86_64 glibc-utils-2.27.9000-14.fc29.x86_64 glusterfs-client-xlators-4.0.1-2.fc29.x86_64 gmime-2.6.23-5.fc28.x86_64 gnome-autoar-devel-0.2.3-1.fc29.x86_64 gnome-backgrounds-3.28.0-1.fc29.noarch 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libssh-debuginfo-0.7.5-8.fc29.x86_64 libtool-ltdl-devel-2.4.6-23.fc29.x86_64 libunistring-debuginfo-0.9.9-1.fc29.x86_64 libunistring-devel-0.9.9-1.fc29.x86_64 libva-devel-2.1.0-1.fc28.x86_64 libvdpau-devel-1.1.1-7.fc28.x86_64 libvncserver-devel-0.9.11-6.fc29.x86_64 libvorbis-devel-1.3.6-1.fc29.x86_64 libvpx-devel-1.7.0-5.fc28.x86_64 libwacom-devel-0.29-1.fc29.x86_64 libXaw-devel-1.0.13-8.fc28.x86_64 libxcrypt-debuginfo-4.0.0-5.fc28.x86_64 libXScrnSaver-devel-1.2.2-14.fc28.x86_64 libxslt-devel-1.1.32-2.fc28.x86_64 lightdm-gobject-devel-1.25.2-1.fc29.x86_64 linux-firmware-20180402-83.git8c1e439c.fc29.noarch lklug-fonts-0.6-17.20090803cvs.fc28.noarch lldpad-1.0.1-9.git036e314.fc28.x86_64 lldpd-0.9.8-2.fc28.x86_64 llvm-devel-6.0.0-11.fc29.x86_64 lm_sensors-3.4.0-10.fc29.x86_64 lohit-assamese-fonts-2.91.5-3.fc28.noarch lohit-bengali-fonts-2.91.5-3.fc28.noarch lohit-devanagari-fonts-2.95.4-3.fc28.noarch lohit-gujarati-fonts-2.92.4-3.fc28.noarch lohit-gurmukhi-fonts-2.91.2-3.fc28.noarch 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opus-devel-1.3-0.4.beta.fc29.x86_64 opusfile-0.10-3.fc29.x86_64 osinfo-db-tools-1.1.0-5.fc28.x86_64 os-prober-1.74-6.fc28.x86_64 overpass-fonts-3.0.2-3.fc28.noarch p7zip-16.02-11.fc29.x86_64 PackageKit-1.1.9-4.fc29.x86_64 PackageKit-gstreamer-plugin-1.1.9-4.fc29.x86_64 PackageKit-gtk3-module-1.1.9-4.fc29.x86_64 paktype-naskh-basic-fonts-4.1-9.fc28.noarch pam-devel-1.3.0-10.fc28.x86_64 pam_krb5-2.4.13-10.fc29.x86_64 parallel-20160722-5.fc28.noarch paratype-pt-sans-fonts-20141121-6.fc28.noarch passwdqc-1.3.0-11.fc28.x86_64 patchutils-0.3.4-10.fc28.x86_64 pciutils-devel-3.5.6-4.fc29.x86_64 pcre2-debuginfo-10.31-4.fc29.x86_64 pcre-debuginfo-8.42-1.fc29.x86_64 perl-generators-1.10-7.fc28.noarch pesign-0.112-22.fc28.x86_64 php-devel-7.2.5~RC1-1.fc29.x86_64 php-fpm-7.2.5~RC1-1.fc29.x86_64 php-json-7.2.5~RC1-1.fc29.x86_64 php-mysqlnd-7.2.5~RC1-1.fc29.x86_64 php-theseer-directoryscanner-1.3.2-3.fc28.noarch php-zetacomponents-console-tools-1.7-7.fc28.noarch picocom-3.1-2.fc28.x86_64 pinentry-1.1.0-3.fc29.x86_64 pinfo-0.6.10-17.fc28.x86_64 polari-3.28.0-1.fc29.x86_64 postgresql-docs-10.3-1.fc29.x86_64 postgresql-server-10.3-1.fc29.x86_64 protobuf-c-1.3.0-4.fc28.x86_64 pulseaudio-libs-devel-11.1-19.fc29.x86_64 pulseaudio-module-x11-11.1-19.fc29.x86_64 python2-devel-2.7.14-15.fc29.x86_64 python3-devel-3.6.5-1.fc29.x86_64 qpdf-libs-8.0.2-1.fc29.x86_64 qt5-qtbase-devel-5.10.1-7.fc29.x86_64 qt5-qtdeclarative-5.10.1-5.fc29.x86_64 rcs-5.9.4-5.fc26.x86_64 readline-devel-7.0-10.fc29.x86_64 rest-devel-0.8.1-2.fc28.x86_64 rng-tools-6.1-4.fc28.x86_64 rootfiles-8.1-22.fc28.noarch rpm-plugin-systemd-inhibit-4.14.1-8.fc28.x86_64 rsync-3.1.3-3.fc28.x86_64 rsyslog-8.34.0-1.fc29.x86_64 screen-4.6.2-3.fc28.x86_64 SDL2-2.0.8-4.fc29.x86_64 SDL-devel-1.2.15-31.fc29.x86_64 setserial-2.17-43.fc29.x86_64 sg3_utils-1.42-4.fc28.x86_64 sharutils-4.15.2-10.fc29.x86_64 sil-abyssinica-fonts-1.200-13.fc28.noarch sil-nuosu-fonts-2.1.1-14.fc28.noarch sil-padauk-fonts-3.002-3.fc28.noarch 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xfce4-terminal-0.8.7.3-2.fc29.x86_64 xfce4-xkb-plugin-0.8.1-2.fc28.x86_64 xfdesktop-4.12.4-4.fc28.x86_64 xmlto-0.0.28-6.fc28.x86_64 xorg-x11-drv-evdev-2.10.5-6.fc29.x86_64 xorg-x11-drv-intel-2.99.917-36.20171025.fc29.x86_64 xorg-x11-drv-libinput-0.27.1-1.fc29.x86_64 xorg-x11-drv-qxl-0.1.5-8.fc29.x86_64 xorg-x11-drv-v4l-0.2.0-52.fc29.x86_64 xorg-x11-drv-wacom-devel-0.36.1-3.fc29.x86_64 xorg-x11-utils-7.5-28.fc29.x86_64 xorg-x11-xkb-extras-7.7-24.fc29.x86_64 zabbix-agentd-3.4.8-1.fc29.x86_64 zabbix-agentd-debuginfo-3.4.8-1.fc29.x86_64 zabbix-debuginfo-3.4.8-1.fc29.x86_64 zabbix-frontend-php-3.4.8-1.fc29.x86_64 zabbix-get-3.4.8-1.fc29.x86_64 zabbix-proxy-3.4.8-1.fc29.x86_64 zabbix-sender-3.4.8-1.fc29.x86_64 zabbix-server-3.4.8-1.fc29.x86_64 zlib-debuginfo-1.2.11-7.fc29.x86_64
it means that all those packages were installed as part of group or manually.
Yes. For clarification: there are two conditions checked to find out, whether package can be autoremoved: 1. it is a leaf package (no other package depends on it) 2. it was installed as a dependency (not manually nor as part of a group)