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Hai all i will give you solution for that 

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Copy this command to file and save it as .sh  and run it in your terminal.

#####

 sudo apt-get update
sudo apt-get upgrade

# instalamos GIT
sudo apt-get install -y git






# Install python3 and dependencies for Odoo 11
sudo apt-get install gcc python3-dev libxml2-dev libxslt1-dev \
libevent-dev libsasl2-dev libldap2-dev libpq-dev \
libpng-dev libjpeg-dev

sudo apt-get -y install python3 python3-pip python-pip
sudo pip3 install vobject qrcode num2words setuptools



###fix cannot import main
1-sudo python3 -m pip uninstall pip
2-sudo apt install python3-pip --reinstall
# FIX issue WKHtmltopdf futur
sudo apt-get install libxrender1

# Install nodejs and less
sudo apt-get install -y npm node-less
sudo ln -s /usr/bin/nodejs /usr/bin/node
sudo npm install -g less




Instalamos PostgreSQL
sudo apt-get install postgresql -y
sudo su - postgres -c "createuser -s $USER"







sudo mkdir /opt/odoo11
sudo mkdir /opt/odoo11/extra-addons
sudo chown -R $USER:root /opt/odoo11






# Download Odoo from git source
cd /opt/odoo11
git clone https://github.com/odoo/odoo.git -b 11.0 --depth 10






sudo pip3 install -r /opt/odoo11/odoo/requirements.txt




start services



/opt/odoo11/odoo/odoo-bin




http://localhost:8069



source
https://odooerpcloud.com/instalar-odoo-11-ubuntu-server-18-04-lts







star /stop odoo

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What is the benefit of this answer in comparison to the original installation advise in the Odoo developer documentation?

Author

Benefits

1- Install in one step

2- Very easy for beginner

Best Answer
Hello, Ashraf!

You can use this Odoo installation script - https://ventor.app/blog/ventor-app-break-causes-measures-compensation/


It allows you to install Odoo (Community and Enterprise) to your server and automatically makes the initial configuration.

What is included in the script (Odoo installer):


- Checking the current Python version*

- Creating a system user Odoo (in Linux)

- Installation and configuration of the PostgreSQL database

- Installation and configuration of selected Odoo version (including Odoo Enterprise installation if you have access to it on GitHub)

- Installation and configuration of a web server (Odoo nginx or Odoo Apache 2)

- Installation of an SSL certificate, so your Odoo database can be accessed via HTTPS using your domain

- Installation and configuration of Logrotate**




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Hi! I tried this in ubuntu 20.10 and I had three errors during the installation:

1) sudo apt-get -y install python3 python3-pip python-pip

Package python-pip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  python3-pip
E: Package 'python-pip' has no installation candidate

so I run: sudo apt-get -y install python3 python3-pip and I continue

2) sudo ln -s /usr/bin/nodejs /usr/bin/node

ln: failed to create symbolic link '/usr/bin/node': File exists
if I do
$ ls -lai /usr/bin/node
75895 -rwxr-xr-x 1 root root 26616 Aug 19  2020 /usr/bin/node
and if I run:
$ ls -lai /usr/bin/nodejs
75897 lrwxrwxrwx 1 root root 4 Aug 19  2020 /usr/bin/nodejs -> node

3) sudo pip3 install -r /opt/odoo11/odoo/requirements.txt 

    Running setup.py install for psycopg2 ... error
    ERROR: Command errored out with exit status 1:
     command: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-34tifaj1/psycopg2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-34tifaj1/psycopg2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-tstv4xqv/install-record.txt --single-version-externally-managed --compile --install-headers /usr/local/include/python3.8/psycopg2
         cwd: /tmp/pip-install-34tifaj1/psycopg2/
    Complete output (65 lines):
    running install
    running build
    running build_py
    creating build
    creating build/lib.linux-x86_64-3.8
    creating build/lib.linux-x86_64-3.8/psycopg2
    copying lib/_ipaddress.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/__init__.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/sql.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/extras.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/errorcodes.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/extensions.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/_range.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/tz.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/psycopg1.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/pool.py -> build/lib.linux-x86_64-3.8/psycopg2
    copying lib/_json.py -> build/lib.linux-x86_64-3.8/psycopg2
    creating build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_errcodes.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_bug_gc.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_dates.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_green.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/testutils.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_types_extras.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_quote.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_bugX000.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_transaction.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_sql.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_cancel.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_psycopg2_dbapi20.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/dbapi20.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/__init__.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_notify.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_module.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_fast_executemany.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_lobject.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_cursor.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_replication.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_async_keyword.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_types_basic.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_connection.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_copy.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_ipaddress.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_async.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/dbapi20_tpc.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_with.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/testconfig.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    copying tests/test_extras_dictcursor.py -> build/lib.linux-x86_64-3.8/psycopg2/tests
    Skipping optional fixer: buffer
    Skipping optional fixer: idioms
    Skipping optional fixer: set_literal
    Skipping optional fixer: ws_comma
    running build_ext
    building 'psycopg2._psycopg' extension
    creating build/temp.linux-x86_64-3.8
    creating build/temp.linux-x86_64-3.8/psycopg
    x86_64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.7.3.1 (dt dec pq3 ext lo64)" -DPG_VERSION_NUM=120600 -DHAVE_LO64=1 -I/usr/include/python3.8 -I. -I/usr/include/postgresql -I/usr/include/postgresql/12/server -c psycopg/psycopgmodule.c -o build/temp.linux-x86_64-3.8/psycopg/psycopgmodule.o -Wdeclaration-after-statement
    psycopg/psycopgmodule.c: In function ‘psyco_is_main_interp’:
    psycopg/psycopgmodule.c:685:18: error: invalid use of incomplete typedef ‘PyInterpreterState’ {aka ‘struct _is’}
      685 |     while (interp->next)
          |                  ^~
    psycopg/psycopgmodule.c:686:24: error: invalid use of incomplete typedef ‘PyInterpreterState’ {aka ‘struct _is’}
      686 |         interp = interp->next;
          |                        ^~
    error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-34tifaj1/psycopg2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-34tifaj1/psycopg2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-tstv4xqv/install-record.txt --single-version-externally-managed --compile --install-headers /usr/local/include/python3.8/psycopg2 Check the logs for full command output.
I dont know how I can continue or I can fix this last one...
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The forum does not allow to post more than one answer. If you want to get help, then please post a new question and do not hijack old ones.

Besides that, you are doing 2 major mistakes here in my opinion:

1. In order to avoid compatibility issues with the requirements, you should install Odoo on an Ubuntu version, which was the current Ubuntu version at the corresponding release date of the Odoo version you want to install.

2. You should only use Ubuntu Longterm Stable versions (LTS).