start-ubuntu20.sh

#!/data/data/com.termux/files/usr/bin/bash
cd $(dirname $0)
## unset LD_PRELOAD in case termux-exec is installed
unset LD_PRELOAD
command="proot"
command+=" --kill-on-exit"
command+=" --link2symlink"
command+=" -0"
command+=" -r ubuntu20-fs"
if [ -n "$(ls -A ubuntu20-binds)" ]; then
    for f in ubuntu20-binds/* ;do
      . $f
    done
fi
command+=" -b /dev"
command+=" -b /proc"
command+=" -b /sys"
command+=" -b /data"
command+=" -b ubuntu20-fs/root:/dev/shm"
command+=" -b /proc/self/fd/2:/dev/stderr"
command+=" -b /proc/self/fd/1:/dev/stdout"
command+=" -b /proc/self/fd/0:/dev/stdin"
command+=" -b /dev/urandom:/dev/random"
command+=" -b /proc/self/fd:/dev/fd"
command+=" -b /data/data/com.termux/files/home/ubuntu20-fs/proc/fakethings/stat:/proc/stat"
command+=" -b /data/data/com.termux/files/home/ubuntu20-fs/proc/fakethings/vmstat:/proc/vmstat"
command+=" -b /data/data/com.termux/files/home/ubuntu20-fs/proc/fakethings/version:/proc/version"
## uncomment the following line to have access to the home directory of termux
#command+=" -b /data/data/com.termux/files/home:/root"
command+=" -b /sdcard"
command+=" -w /root"
command+=" /usr/bin/env -i"
command+=" MOZ_FAKE_NO_SANDBOX=1"
command+=" HOME=/root"
command+=" PATH=/usr/local/sbin:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/games:/usr/local/games"
command+=" TERM=$TERM"
command+=" LANG=C.UTF-8"
command+=" /bin/bash --login"
com="$@"
if [ -z "$1" ];then
    exec $command
else
    $command -c "$com"
fi