Jerry, I did it via command line and the result is:
sudo apt-get remove --purge lite-software lite-themes
[sudo] password for rumen:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
lite-software* lite-themes*
WARNING: The following essential packages will be removed.
This should NOT be done unless you know exactly what you are doing!
lite-software lite-themes
0 upgraded, 0 newly installed, 2 to remove and 29 not upgraded.
1 not fully installed or removed.
After this operation, 79,4 MB disk space will be freed.
You are about to do something potentially harmful.
To continue type in the phrase 'Yes, do as I say!'
?] Yes, do as I say!
dpkg: warning: overriding problem because --force enabled:
dpkg: warning: this is an essential package; it should not be removed
(Reading database ... 232412 files and directories currently installed.)
Removing lite-software (2.0-0460-linuxlite) ...
dpkg: warning: overriding problem because --force enabled:
dpkg: warning: this is an essential package; it should not be removed
Removing lite-themes (2.0-0130-linuxlite) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu5.2) ...
Processing triggers for gnome-menus (3.13.3-6ubuntu3.1) ...
Processing triggers for mime-support (3.59ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.15-0ubuntu1.1) ...
Processing triggers for gnome-icon-theme (3.12.0-1ubuntu3) ...
Processing triggers for fontconfig (2.11.94-0ubuntu1.1) ...
rumen@rumen-Precision-M90:~$ sudo apt-get clean
rumen@rumen-Precision-M90:~$ sudo apt-get update
Hit:1
http://ppa.launchpad.net/deluge-team/ppa/ubuntu xenial InRelease
Hit:2
http://archive.ubuntu.com/ubuntu xenial InRelease
Hit:3
http://packages.microsoft.com/repos/vscode stable InRelease
Get:4
http://archive.ubuntu.com/ubuntu xenial-security InRelease [107 kB]
Hit:5
http://ppa.launchpad.net/git-core/ppa/ubuntu xenial InRelease
Hit:6
http://archive.canonical.com xenial InRelease
Hit:7
http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu xenial InRelease
Ign:8
http://dl.google.com/linux/chrome/deb stable InRelease
Hit:9
http://dl.google.com/linux/chrome/deb stable Release
Hit:10
http://ppa.launchpad.net/nemh/systemback/ubuntu xenial InRelease
Hit:11
http://archive.ubuntu.com/ubuntu xenial-updates InRelease
Get:12
http://archive.ubuntu.com/ubuntu xenial-proposed InRelease [260 kB]
Hit:13
http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu xenial InRelease
Hit:14
http://repo.linuxliteos.com/linuxlite citrine InRelease
Hit:15
http://ppa.launchpad.net/yg-jensge/shotwell/ubuntu xenial InRelease
Hit:16
http://archive.ubuntu.com/ubuntu xenial-backports InRelease
Fetched 367 kB in 2s (132 kB/s)
Reading package lists... Done
rumen@rumen-Precision-M90:~$ sudo apt-get install lite-software lite-themes
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
lite-software lite-themes
0 upgraded, 2 newly installed, 0 to remove and 29 not upgraded.
Need to get 33,4 MB of archives.
After this operation, 79,4 MB of additional disk space will be used.
Get:1
http://repo.linuxliteos.com/linuxlite citrine/main amd64 lite-software all 2.0-0460-linuxlite [821 kB]
Get:2
http://repo.linuxliteos.com/linuxlite citrine/main amd64 lite-themes all 2.0-0130-linuxlite [32,6 MB]
Fetched 33,4 MB in 20s (1595 kB/s)
Selecting previously unselected package lite-software.
(Reading database ... 207895 files and directories currently installed.)
Preparing to unpack .../lite-software_2.0-0460-linuxlite_all.deb ...
Unpacking lite-software (2.0-0460-linuxlite) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu5.2) ...
Processing triggers for gnome-menus (3.13.3-6ubuntu3.1) ...
Processing triggers for mime-support (3.59ubuntu1) ...
Setting up lite-software (2.0-0460-linuxlite) ...
chown: cannot access '/usr/share/icons/Faenza*': No such file or directory
dpkg: error processing package lite-software (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
lite-software
E: Sub-process /usr/bin/dpkg returned an error code (1)