Install Aria2 and webui on Raspberry Pi with one simple script.

RPi-aria2-with-webui.sh

#!/bin/sh

DOWNLOAD_DIR="${HOME}/MiniDLNA"
CONFIG_DIR="${HOME}/.aria2"
RPC_TOKEN="changeIt"
RPC_PORT="6800"

change_apt_source(){
	if [ -f /etc/apt/sources.list ]; then
		sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
	fi
	sudo sed -i '/^deb.*/s/^/# /g' /etc/apt/sources.list
	sudo chmod 666 /etc/apt/sources.list
	sudo echo "deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ jessie main non-free contrib" >> /etc/apt/sources.list
	sudo echo "deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ jessie main non-free contrib" >> /etc/apt/sources.list
	sudo chmod 644 /etc/apt/sources.list

}
# change_apt_source

sudo apt-get update
sudo apt-get install -y aria2 ca-certificates

if [ ! -d ${DOWNLOAD_DIR} ]; then
    mkdir -p ${DOWNLOAD_DIR}
fi

if [ ! -d ${CONFIG_DIR} ]; then
    mkdir -p ${CONFIG_DIR}
fi

if [ ! -f ${CONFIG_DIR}/aria2.session ]; then
	touch ${CONFIG_DIR}/aria2.session
fi
if [ ! -f ${CONFIG_DIR}/aria2.log ]; then
	touch ${CONFIG_DIR}/aria2.log
fi

if [ -f ${CONFIG_DIR}/aria2.conf ];then
	mv ${CONFIG_DIR}/aria2.conf ${CONFIG_DIR}/aria2.conf.bak
fi

# Generate cfg file
cat > ${CONFIG_DIR}/aria2.conf <<-EOCFG
# For full reference:
# https://aria2.github.io/manual/en/html/aria2c.html
##
dir=${DOWNLOAD_DIR}
file-allocation=trunc
continue=true
# daemon=true
##
log=${CONFIG_DIR}/aria2.log
console-log-level=warn
log-level=notice
##
max-concurrent-downloads=5
max-connection-per-server=10
min-split-size=5M
split=10
disable-ipv6=true
##
input-file=${CONFIG_DIR}/aria2.session
save-session=${CONFIG_DIR}/aria2.session
save-session-interval=30
##
enable-rpc=true
rpc-allow-origin-all=true
rpc-listen-all=true
rpc-listen-port=${RPC_PORT}
rpc-secret=${RPC_TOKEN}
##
follow-torrent=mem
follow-metalink=mem
enable-dht6=false
peer-id-prefix=-TR2770-
user-agent=Transmission/2.77
seed-time=0
#seed-ratio=1.0
bt-seed-unverified=true
bt-save-metadata=true
EOCFG


# MiniDLNA
sudo apt-get install -y minidlna
sudo cp /etc/minidlna.conf /etc/minidlna.conf.origin
sudo sed -i 's#^media_dir=/.*#media_dir='${DOWNLOAD_DIR}'#g' /etc/minidlna.conf
sudo sed -i '/#inotify=yes/s/#//g' minidlna.conf #Enable media auto discover
sudo sed -i '$a fs.inotify.max_user_watches=65536' /etc/sysctl.conf


# aria2-webui on lighttpd
sudo apt-get install -y lighttpd unzip
wget https://github.com/ziahamza/webui-aria2/archive/master.zip
unzip -qu master.zip
cd webui-aria2-master/
change_token(){
	sed -i '/token:/s/\/\///g' configuration.js
	sed -i 's/\$YOUR_SECRET_TOKEN\$/'${RPC_TOKEN}'/g' configuration.js
}

# change_token

sudo cp -Rfu . /var/www/html/
cd ..
rm -rf webui-aria2-master master.zip

echo "Done!"
echo "Your Aria2 configuration and log file are in : ${CONFIG_DIR}"
echo "Your RPC token is: ${RPC_TOKEN}"
echo "Start aria2 with 'aria2c -D' and enjoy!"

it worked! i typed the local ip address of my raspberry pi server and it displayed the aria2 web ui. But it looks like an unfinished html webpage. Attached is the print screen of the web ui

how can I completely reverse the changes made by this script?