ModuleNotFoundError: No module named 'jinja2'

FAILED: cd /home/ubuntu/shelley/Firmware/build/px4_sitl_default/build_gazebo && /usr/bin/python /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/scripts/jinja_gen.py /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/models/sf10a/sf10a.sdf.jinja /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo
Traceback (most recent call last):
  File "/home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/scripts/jinja_gen.py", line 4, in
    import jinja2
ModuleNotFoundError: No module named 'jinja2'
FAILED: cd /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo && rm -f /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/models/iris/iris.sdf && /usr/bin/python /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/scripts/xacro.py -o /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/models/rotors_description/urdf/iris_base.urdf /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/models/rotors_description/urdf/iris_base.xacro enable_mavlink_interface:=true enable_ground_truth:=false enable_wind:=false enable_logging:=false rotors_description_dir:=/home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/models/rotors_description send_vision_estimation:=true send_odometry:=false && gz sdf -p /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/models/rotors_description/urdf/iris_base.urdf >> /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/models/iris/iris.sdf && rm -f /home/ubuntu/shelley/Firmware/Tools/sitl_gazebo/models/rotors_description/urdf/iris_base.urdf

gz: error while loading shared libraries: libboost_thread.so.1.54.0: cannot open shared object file: No such file or directory
ninja: build stopped: subcommand failed.
ninja: build stopped: subcommand failed.
make: *** [px4_sitl_default] Error 1

Solution (解决办法):

sudo -H pip install jinja2 -i http://mirrors.aliyun.com/pypi/simple --trusted-host mirrors.aliyun.com
Looking in indexes: http://mirrors.aliyun.com/pypi/simple
Collecting jinja2
  Downloading http://mirrors.aliyun.com/pypi/packages/1d/e7/fd8b501e7a6dfe492a433deb7b9d833d39ca74916fa8bc63dd1a4947a671/Jinja2-2.10.1-py2.py3-none-any.whl (124kB)
     |████████████████████████████████| 133kB 6.1MB/s 
Collecting MarkupSafe>=0.23 (from jinja2)
  Downloading http://mirrors.aliyun.com/pypi/packages/98/7b/ff284bd8c80654e471b769062a9b43cc5d03e7a615048d96f4619df8d420/MarkupSafe-1.1.1-cp37-cp37m-manylinux1_x86_64.whl
Installing collected packages: MarkupSafe, jinja2
Successfully installed MarkupSafe-1.1.1 jinja2-2.10.1