Solved .
if you run the scripts on the Ubuntu 20 and it just exits without an obvious error, skip the 20 version , try to install ubuntu 18 then it will be fine .
have no idea what the issue is but finaly i made it work already so let's end this 
thanks for the help @nebulon
ya next time i will try the Ubuntu 20 again .thanks for your help .
Got error while installing the cloudron on a fresh Ubuntu 20.04 (x64) server
steps:
root@ls-529811-17286-17286:~# wget https://cloudron.io/cloudron-setup
--2022-03-14 17:03:32-- https://cloudron.io/cloudron-setup
Resolving cloudron.io (cloudron.io)... 3.209.21.239, 2600:1f18:80f:e00:fa5d:db49:3bf:3f22
Connecting to cloudron.io (cloudron.io)|3.209.21.239|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 9057 (8.8K) [application/octet-stream]
Saving to: ‘cloudron-setup’
cloudron-setup 100%[===========================================================================================================================================>] 8.84K --.-KB/s in 0s
2022-03-14 17:03:33 (135 MB/s) - ‘cloudron-setup’ saved [9057/9057]
root@ls-529811-17286-17286:~# chmod +x cloudron-setup
root@ls-529811-17286-17286:~# ./cloudron-setup
##############################################
Cloudron Setup (latest)
##############################################
Follow setup logs in a second terminal with:
$ tail -f /var/log/cloudron-setup.log
Join us at https://forum.cloudron.io for any questions.
=> Updating apt and installing script dependencies
=> Checking version
=> Downloading version 7.1.3 ...
=> Installing base dependencies and downloading docker images (this takes some time) ...
=> Installing version 7.1.3 (this takes some time) ...
Failed to install cloudron. See /var/log/cloudron-setup.log for details
root@ls-529811-17286-17286:~# vi /var/log/cloudron-setup.log
Log info (cloudron-setup.log)
Here is the logs:
Running cloudron-setup with args : --
Hit:1 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists...
Reading package lists...
Building dependency tree...
Reading state information...
python3 is already the newest version (3.8.2-0ubuntu2).
python3 set to manually installed.
ubuntu-standard is already the newest version (1.450.2).
The following packages were automatically installed and are no longer required:
eatmydata libeatmydata1 python3-importlib-metadata python3-jinja2
python3-json-pointer python3-jsonpatch python3-jsonschema python3-markupsafe
python3-more-itertools python3-pyrsistent python3-zipp
Use 'apt autoremove' to remove them.
The following packages will be upgraded:
curl libcurl4 python3-software-properties software-properties-common
4 upgraded, 0 newly installed, 0 to remove and 124 not upgraded.
Need to get 431 kB of archives.
After this operation, 2,048 B of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 curl amd64 7.68.0-1ubuntu2.7 [161 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libcurl4 amd64 7.68.0-1ubuntu2.7 [234 kB]
Get:3 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 software-properties-common all 0.99.9.8 [10.6 kB]
Get:4 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 python3-software-properties all 0.99.9.8 [24.9 kB]
Fetched 431 kB in 2s (283 kB/s)
(Reading database ... ^M(Reading database ... 5%^M(Reading database ... 10%^M(Reading database ... 15%^M(Reading database ... 20%^M(Reading database ... 25%^M(Reading database ... 30%^M(Reading database ... 35%^M(Reading database ... 40%^M(Reading database ... 45%^M(Reading database ... 50%^M(Reading database ... 55%^M(Reading database ... 60%^M(Reading database ... 65%^M(Reading database ... 70%^M(Reading database ... 75%^M(Reading database ... 80%^M(Reading database ... 85%^M(Reading database ... 90%^M(Reading database ... 95%^M(Reading database ... 100%^M(Reading database ... 72732 files and directories currently installed.)^M
Preparing to unpack .../curl_7.68.0-1ubuntu2.7_amd64.deb ...^M
Unpacking curl (7.68.0-1ubuntu2.7) over (7.68.0-1ubuntu2.5) ...^M
Preparing to unpack .../libcurl4_7.68.0-1ubuntu2.7_amd64.deb ...^M
Unpacking libcurl4:amd64 (7.68.0-1ubuntu2.7) over (7.68.0-1ubuntu2.5) ...^M
Preparing to unpack .../software-properties-common_0.99.9.8_all.deb ...^M
Unpacking software-properties-common (0.99.9.8) over (0.98.9.5) ...^M
Preparing to unpack .../python3-software-properties_0.99.9.8_all.deb ...^M
Unpacking python3-software-properties (0.99.9.8) over (0.98.9.5) ...^M
Setting up python3-software-properties (0.99.9.8) ...^M
Setting up libcurl4:amd64 (7.68.0-1ubuntu2.7) ...^M
Setting up curl (7.68.0-1ubuntu2.7) ...^M
Setting up software-properties-common (0.99.9.8) ...^M
Processing triggers for libc-bin (2.31-0ubuntu9.2) ...^M
Processing triggers for man-db (2.9.1-1) ...^M
Processing triggers for dbus (1.12.16-2ubuntu2.1) ...^M
"/var/log/cloudron-setup.log" 2477L, 160528C
Anyone help me with this please ..................i have tried 8 times : reinstall fresh Ubuntu 20 , run the
wget https://cloudron.io/cloudron-setup
chmod +x ./cloudron-setup
./cloudron-setup
again and again . same error everytime .
Thank you so much .