Detailed steps to install Anaconda on Linux (Ubuntu 18.04)

$ sudo sh Anaconda3-5.3.0-Linux-x86_64.sh 
[sudo] Password for andrew: 
Welcome to Anaconda3 5.3.0
In order to continue the installation process, please review the license
agreement.
Please, press ENTER to continue
>>> # Press Enter... # Press the spacebar multiple times to finish reading the license.
Do you accept the license terms? [yes|no]
[no] >>> yes # Enter yes
 - Press ENTER to confirm the location
 - Press CTRL-C to abort the installation
 - Or specify a different location below
...
[/home/andrew/anaconda3] >>> /usr/local/anaconda3 # Enter custom directory... # The installation usually takes several minutes, depending on the performance of the machine.
# Discussion DingTalk group 21745728 QQ group 144081101 567351477
# This article address: https://www.jianshu.com/p/9fe9ff999234
Do you wish to proceed with the installation of Microsoft VSCode? [yes|no] #Select no. Generally speaking, the built-in spyder and professional IDE wingIDE are better to use.
...
Do you wish the installer to initialize Anaconda3
in your /home/andrew/.bashrc ? [yes|no]
[no] >>> # Select yes
Initializing Anaconda3 in /home/andrew/.bashrc
A backup will be made to: /home/andrew/.bashrc-anaconda3.bak
For this change to become active, you have to open a new terminal.
Thank you for installing Anaconda3!
===========================================================================
Anaconda is partnered with Microsoft! Microsoft VSCode is a streamlined
code editor with support for development operations like debugging, task
running and version control.
To install Visual Studio Code, you will need:
 -Administrator Privileges
 - Internet connectivity
Visual Studio Code License: https://code.visualstudio.com/license
Do you wish to proceed with the installation of Microsoft VSCode? [yes|no]
>>> no

Add “export PATH=/usr/local/anconda3/bin:$PATH“ to /etc/profile so that all users can use Anaconda python3.7.

The above .bashrc has the following content added during installation:

# added by Anaconda3 5.3.0 installer
# >>> conda init >>>
# !! Contents within this block are managed by 'conda init' !!
__conda_setup="$(CONDA_REPORT_ERRORS=false '/usr/local/anaconda3/bin/conda' shell.bash hook 2> /dev/null)"
if [ $? -eq 0 ]; then
 \eval "$__conda_setup"
else
 if [ -f "/usr/local/anaconda3/etc/profile.d/conda.sh" ]; then
 . "/usr/local/anaconda3/etc/profile.d/conda.sh"
 CONDA_CHANGEPS1=false conda activate base
 else
 \export PATH="/usr/local/anaconda3/bin:$PATH"
 fi
fi
unset __conda_setup ~/.bashrc
# <<< conda init <<<

$ conda info
 active environment : base
 active env location : /usr/local/anaconda3
  shell level : 1
 user config file : /home/andrew/.condarc
 populated config files: 
  conda version : 4.5.11
 conda-build version : 3.15.1
  Python version: 3.7.0.final.0
 base environment : /usr/local/anaconda3 (read only)
  channel URLs : https://repo.anaconda.com/pkgs/main/linux-64
    https://repo.anaconda.com/pkgs/main/noarch
    https://repo.anaconda.com/pkgs/free/linux-64
    https://repo.anaconda.com/pkgs/free/noarch
    https://repo.anaconda.com/pkgs/r/linux-64
    https://repo.anaconda.com/pkgs/r/noarch
    https://repo.anaconda.com/pkgs/pro/linux-64
    https://repo.anaconda.com/pkgs/pro/noarch
  package cache : /usr/local/anaconda3/pkgs
    /home/andrew/.conda/pkgs
 envs directories : /home/andrew/.conda/envs
    /usr/local/anaconda3/envs
  platform : linux-64
  user-agent : conda/4.5.11 requests/2.19.1 CPython/3.7.0 Linux/4.15.0-36-generic ubuntu/18.04 glibc/2.27
  UID:GID : 1000:1000
  netrc file : None
  offline mode : False
$ python
Python 3.7.0 (default, Jun 28 2018, 13:15:42) 
[GCC 7.2.0] :: Anaconda, Inc. on Linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

$ conda update conda
$ conda update anaconda

$ sudo rm -rf /usr/local/anaconda3
Delete the above ~/.bashrc and /etc/profile modifications and clear the hidden files: rm -rf ~/.condarc ~/.conda ~/.continuum