How to completely remove a package?
How to fully remove a package?
I have installed software Munin and then removed it and tried to install again, 2nd install did not have the config files, so used below, which fully removed the sofware and new install was fine with all config.
Removing packages with sudo apt purge ... or sudo apt --purge remove ... will remove them and all their global (i.e., systemwide) configuration files.
# apt-get --purge remove munin
I removing using just remove, some folders were there for software, so removed them usin 'rm', then performed an install, it did not install fully with the config fixes. So the --purge did the trick for me.
root@linux-u20:~# apt remove munin munin-node
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'munin' is not installed, so not removed
Package 'munin-node' is not installed, so not removed
The following packages were automatically installed and are no longer required:
jo jq libalgorithm-c3-perl libb-hooks-endofscope-perl libb-hooks-op-check-perl libclass-c3-perl libclass-c3-xs-perl libclass-data-inheritable-perl libclass-method-modifiers-perl
libclass-xsaccessor-perl libdata-optlist-perl libdate-manip-perl libdbi1 libdevel-callchecker-perl libdevel-caller-perl libdevel-globaldestruction-perl libdevel-lexalias-perl
libdevel-stacktrace-perl libdist-checkconflicts-perl libdynaloader-functions-perl libemail-date-format-perl libeval-closure-perl libexception-class-perl libexporter-tiny-perl
libfile-copy-recursive-perl libio-multiplex-perl libipc-shareable-perl libjq1 liblist-moreutils-perl liblog-dispatch-perl liblog-log4perl-perl libmail-sendmail-perl libmime-lite-perl
libmime-types-perl libmodule-implementation-perl libmodule-runtime-perl libmro-compat-perl libnamespace-autoclean-perl libnamespace-clean-perl libnet-cidr-perl libnet-server-perl
libnet-snmp-perl libonig5 libpackage-stash-perl libpackage-stash-xs-perl libpadwalker-perl libparams-classify-perl libparams-util-perl libparams-validationcompiler-perl libreadonly-perl
libref-util-perl libref-util-xs-perl librole-tiny-perl librrd8 librrds-perl libspecio-perl libsub-exporter-perl libsub-exporter-progressive-perl libsub-identify-perl libsub-install-perl
libsub-quote-perl libsys-hostname-long-perl libvariable-magic-perl libxstring-perl munin-common munin-doc munin-plugins-core munin-plugins-extra rrdtool
Use 'apt autoremove' to remove them.
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
root@linux-u20:~# apt-get --purge remove munin
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
jo jq libalgorithm-c3-perl libb-hooks-endofscope-perl libb-hooks-op-check-perl libclass-c3-perl libclass-c3-xs-perl libclass-data-inheritable-perl libclass-method-modifiers-perl
libclass-xsaccessor-perl libdata-optlist-perl libdate-manip-perl libdbi1 libdevel-callchecker-perl libdevel-caller-perl libdevel-globaldestruction-perl libdevel-lexalias-perl
libdevel-stacktrace-perl libdist-checkconflicts-perl libdynaloader-functions-perl libemail-date-format-perl libeval-closure-perl libexception-class-perl libexporter-tiny-perl
libfile-copy-recursive-perl libio-multiplex-perl libipc-shareable-perl libjq1 liblist-moreutils-perl liblog-dispatch-perl liblog-log4perl-perl libmail-sendmail-perl libmime-lite-perl
libmime-types-perl libmodule-implementation-perl libmodule-runtime-perl libmro-compat-perl libnamespace-autoclean-perl libnamespace-clean-perl libnet-cidr-perl libnet-server-perl
libnet-snmp-perl libonig5 libpackage-stash-perl libpackage-stash-xs-perl libpadwalker-perl libparams-classify-perl libparams-util-perl libparams-validationcompiler-perl libreadonly-perl
libref-util-perl libref-util-xs-perl librole-tiny-perl librrd8 librrds-perl libspecio-perl libsub-exporter-perl libsub-exporter-progressive-perl libsub-identify-perl libsub-install-perl
libsub-quote-perl libsys-hostname-long-perl libvariable-magic-perl libxstring-perl munin-common munin-doc munin-plugins-core munin-plugins-extra rrdtool
Use 'apt autoremove' to remove them.
The following packages will be REMOVED
munin*
0 to upgrade, 0 to newly install, 1 to remove and 0 not to upgrade.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
(Reading database ... 175171 files and directories currently installed.)
Purging configuration files for munin (2.0.56-1ubuntu1) ...
apache2_invoke postrm: Purging configuration munin.conf
dpkg: warning: while removing munin, directory '/var/lib/munin' not empty so not removed
dpkg: warning: while removing munin, directory '/var/cache/munin/www' not empty so not removed
Processing triggers for systemd (245.4-4ubuntu3.3) ...
root@linux-u20:~# apt-get --purge remove munin munin-node
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'munin' is not installed, so not removed
The following packages were automatically installed and are no longer required:
jo jq libalgorithm-c3-perl libb-hooks-endofscope-perl libb-hooks-op-check-perl libclass-c3-perl libclass-c3-xs-perl libclass-data-inheritable-perl libclass-method-modifiers-perl
libclass-xsaccessor-perl libdata-optlist-perl libdate-manip-perl libdbi1 libdevel-callchecker-perl libdevel-caller-perl libdevel-globaldestruction-perl libdevel-lexalias-perl
libdevel-stacktrace-perl libdist-checkconflicts-perl libdynaloader-functions-perl libemail-date-format-perl libeval-closure-perl libexception-class-perl libexporter-tiny-perl
libfile-copy-recursive-perl libio-multiplex-perl libipc-shareable-perl libjq1 liblist-moreutils-perl liblog-dispatch-perl liblog-log4perl-perl libmail-sendmail-perl libmime-lite-perl
libmime-types-perl libmodule-implementation-perl libmodule-runtime-perl libmro-compat-perl libnamespace-autoclean-perl libnamespace-clean-perl libnet-cidr-perl libnet-server-perl
libnet-snmp-perl libonig5 libpackage-stash-perl libpackage-stash-xs-perl libpadwalker-perl libparams-classify-perl libparams-util-perl libparams-validationcompiler-perl libreadonly-perl
libref-util-perl libref-util-xs-perl librole-tiny-perl librrd8 librrds-perl libspecio-perl libsub-exporter-perl libsub-exporter-progressive-perl libsub-identify-perl libsub-install-perl
libsub-quote-perl libsys-hostname-long-perl libvariable-magic-perl libxstring-perl munin-common munin-doc munin-plugins-core munin-plugins-extra rrdtool
Use 'apt autoremove' to remove them.
The following packages will be REMOVED
munin-node*
0 to upgrade, 0 to newly install, 1 to remove and 0 not to upgrade.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
(Reading database ... 175127 files and directories currently installed.)
Purging configuration files for munin-node (2.0.56-1ubuntu1) ...
Processing triggers for systemd (245.4-4ubuntu3.3) ...
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