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Installation fails due to not enough memory on host

See original GitHub issue

Hi! I have problems installing on a fresh Ubuntu Server 18.04 LTS VM following this tutorial. Seems that the conda install gets aborted? Output is:

Checking if TLJH is already installed...
TLJH already installed, upgrading...
Upgrading TLJH installer...
Setup tljh package
Starting TLJH installer...
Setting up admin users
Granting passwordless sudo to JupyterHub admins...
Setting up user environment...
Traceback (most recent call last):
  File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/opt/tljh/hub/lib/python3.6/site-packages/tljh/installer.py", line 448, in <module>
    main()
  File "/opt/tljh/hub/lib/python3.6/site-packages/tljh/installer.py", line 430, in main
    ensure_user_environment(args.user_requirements_txt_url)
  File "/opt/tljh/hub/lib/python3.6/site-packages/tljh/installer.py", line 234, in ensure_user_environment
    'conda==4.5.8'
  File "/opt/tljh/hub/lib/python3.6/site-packages/tljh/conda.py", line 95, in ensure_conda_packages
    ] + packages).decode()
  File "/usr/lib/python3.6/subprocess.py", line 336, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.6/subprocess.py", line 418, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['/opt/tljh/user/bin/python', '-m', 'conda', 'install', '-c', 'conda-forge', '--json', '--prefix', '/opt/tljh/user', 'conda==4.5.8']' died with <Signals.SIGKILL: 9>.