Creating a good installer for Linux (Mint/Ubuntu)

Question

recently I created a script to install easily a software called AVInaptic. I'd like to know if these steps are good enough and how to get across to the system that the software was installed. Moreover I'd like to link an uninstaller to the installation How can I do?

Here you can see the code

First I get the desktop folder name (depends from the system language )

if [ -r ~/.config/user-dirs.dirs ]
then
    . ~/.config/user-dirs.dirs
fi
if [ "$XDG_DESKTOP_DIR" = "" ]
then
    export XDG_DESKTOP_DIR=$HOME/Desktop
fi
#XDG_DESKTOP_DIR contains the name of the desktop

Declare the variables used in the installer

#It's the command given to the shell to execute the program
export CMD=avinaptic
#It's the name of the program
export NAME="AVInaptic"

#Auto-generated or fixed variables
export TEMP_NAME=~/temp_$CMD
export FOLDER_NAME=/opt/$CMD
export ICON_SUFFIX=.png
export LIB_FOLDER="/usr/lib32"

#Other info
export LINK_ICON="https://chakraos.org/ccr/packages/av/avinaptic2/avinaptic2/avinaptic2.png"
export LINK_SOFTWARE="http://fsinapsi.altervista.org/code/avinaptic/avinaptic.zip"
export GENERIC_NAME="Report Video"
export CATEG="GTK;AudioVideo;"
export EN_COM="A free utility which reports many technical informations about multimedia files."
export IT_COM="Un programma che analizza file file multimediali e mostra informazioni sulle caratteristiche tecniche."

I create the folders I'll use

echo '###Creating folder###'
sudo mkdir -p $FOLDER_NAME
mkdir $TEMP_NAME
mkdir -p ~/bin

I install all the needed libraries

echo '###Installing dependencies###'
sudo mkdir -p $LIB_FOLDER/libgtk
sudo mkdir -p $LIB_FOLDER/libgmp
#Download libraries
#Download libgtk
echo '###Download libgtk###'
wget -q http://fsinapsi.altervista.org/code/avinaptic/libgtk.zip -O $TEMP_NAME/libgtk.zip
#Download libiconv
echo '###Download libiconv###'
sudo wget -q http://fsinapsi.altervista.org/code/avinaptic/libiconv.zip -O $TEMP_NAME/libiconv.zip
#Download libgmp
echo '###Download libgmp###'
sudo wget -q http://fsinapsi.altervista.org/code/avinaptic/libgmp.zip -O $TEMP_NAME/libgmp.zip
#Download libjpeg
sudo wget -q http://ftp.it.debian.org/debian/pool/main/libj/libjpeg6b/libjpeg62_6b1-1_i386.deb -O $TEMP_NAME/libjpeg.deb
#Install libraries
sudo unzip $TEMP_NAME/libgtk.zip -d /usr/lib32/libgtk/
sudo unzip $TEMP_NAME/libiconv.zip -d /usr/lib32/
sudo unzip $TEMP_NAME/libgmp.zip -d /usr/lib32/libgmp/
sudo gdebi --n $TEMP_NAME/libjpeg.deb
#Create config
sudo rm -f /etc/ld.so.conf.d/avinaptic.conf
sudo printf '/usr/lib32\n/usr/lib32/libgtk\n/usr/lib32/libgmp' > /etc/ld.so.conf.d/avinaptic.conf
#Update libraries
sudo ldconfig
echo '###Dependencies installed###'

I download Main Software

echo '###Download Main Software###'
wget "$LINK_SOFTWARE" -O "$TEMP_NAME/$CMD.zip"

#Start settings
echo '###Setting up...###'
#Move Software to his folder
sudo unzip "$TEMP_NAME/$CMD.zip" -d "$FOLDER_NAME"

echo '###Create script###'
echo "#!/bin/bash
# Purpose:  
# Usage:    
# Author:   Timmy93
# Date:     
# Version:  
# Disclaimer:
$FOLDER_NAME/$CMD" > $TEMP_NAME/$CMD
sudo mv "$TEMP_NAME/$CMD" ~/bin/

echo '###Make it executable###'
chmod +x ~/bin/$CMD


#Create Hard Link
echo '###Create Hard Link###'
sudo ln -s ~/bin/$CMD /usr/local/bin
#Download Icon
wget -q $LINK_ICON -O $TEMP_NAME/$CMD$ICON_SUFFIX
sudo mv $TEMP_NAME/$CMD$ICON_SUFFIX /usr/share/pixmaps

#Create Shortcuts
shortcut="[Desktop Entry]
Encoding=UTF-8
Version=1.0
Name=$NAME
GenericName=$GENERIC_NAME
Exec=$CMD
Terminal=false
Icon=$CMD
Type=Application
Categories=$CATEG
Comment=$EN_COM
Comment[it]=$IT_COM"
echo "$shortcut" > "$TEMP_NAME/$NAME.desktop"
chmod +x "$TEMP_NAME/$NAME.desktop"
sudo cp "$TEMP_NAME/$NAME.desktop" /usr/share/applications/
cp "$TEMP_NAME/$NAME.desktop" "$XDG_DESKTOP_DIR/$NAME.desktop"

I remove useless files

rm -rf -f "$TEMP_NAME"

echo '###All done###'

EDIT: Here is the uninstaller I've written (I've omitted the variable because they are equals):

echo '###Start unistalling ...###'
#Remove dependencies
sudo rm -rf -f $LIB_FOLDER/libgtk/
sudo rm -rf -f $LIB_FOLDER/libgmp/
sudo rm -f $LIB_FOLDER/libiconv.so.2
sudo rm -f /etc/ld.so.conf.d/avinaptic.conf
#Removes folders
sudo rm -f -rf $FOLDER_NAME
sudo rm -f -rf $TEMP_NAME
#Removes scripts
sudo rm -f /usr/local/bin/$CMD
sudo rm -f ~/bin/$CMD
#Removes setting
sudo rm -f /etc/ld.so.conf.d/avinaptic.conf
#Removes icon
sudo rm -f /usr/share/pixmaps/$CMD$ICON_SUFFIX
#Removes shortcuts
sudo rm -f /usr/share/applications/$NAME.desktop
sudo rm -f $XDG_DESKTOP_DIR/$NAME.desktop

#Update libraries
sudo ldconfig
echo '###All done###'