我尝试在远程 Lubuntu 上启动 xpra 服务器并通过以下命令连接到它。但我无法访问遥控器的扬声器、麦克风和网络摄像头，并且它们在本地系统托盘中显示为灰色（另请参阅https://xpra.org/trac/wiki/Sound）。我该如何访问它们？谢谢。
$ xpra shadow ssh:olive:0
2019-10-30 18:28:18,266 Xpra gtk2 client version 2.1.3-r17247M 64-bit
2019-10-30 18:28:18,266 running on Linux Ubuntu 18.04 bionic
2019-10-30 18:28:18,268 Warning: failed to import opencv:
2019-10-30 18:28:18,268 No module named cv2
2019-10-30 18:28:18,268 webcam forwarding is disabled
Warning: failed to import GStreamer 1.x:
Namespace Gst not available
2019-10-30 18:28:20,088 Error: failed to query sound subsystem:
2019-10-30 18:28:20,088 query did not return any data
2019-10-30 18:28:21,492 Warning: vendor 'Intel Open Source Technology Center' is greylisted,
2019-10-30 18:28:21,493 you may want to turn off OpenGL if you encounter bugs
2019-10-30 18:28:21,517 PyOpenGL warning: missing accelerate module
2019-10-30 18:28:21,607 OpenGL enabled with Mesa DRI Mobile Intel® GM45 Express Chipset
2019-10-30 18:28:21,685 keyboard settings: rules=evdev, model=pc105, layout=us
2019-10-30 18:28:21,689 desktop size is 1440x900 with 1 screen:
2019-10-30 18:28:21,691 :0.0 (381x238 mm - DPI: 96x96) workarea: 1440x876
2019-10-30 18:28:21,692 monitor 1 (303x190 mm - DPI: 120x120)
Warning: cannot use the system proxy for 'shadow' subcommand,
failed to connect to '/run/xpra/system':
[Errno 2] No such file or directory
Entering daemon mode; any further errors will be reported to:
/run/user/1000/xpra/:0.log
2019-10-30 18:28:39,528 Xpra shadow server version 2.1.3-r17247 64-bit
2019-10-30 18:28:39,529 running on Linux Ubuntu 18.04 bionic
2019-10-30 18:28:39,530 enabled remote logging
2019-10-30 18:31:16,089 server is not responding, drawing spinners over the windows
2019-10-30 18:31:16,842 server is OK again
Warning: failed to import GStreamer 1.x:
Namespace Gst not available
我尝试遵循 Stephen 的评论，但无法在 Python 2 或 3 中安装这两个 python 包。为什么？
$ sudo pip install python-gst-1.0 python-opencv
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
WARNING: The directory '/home/t/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
WARNING: The directory '/home/t/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
ERROR: Could not find a version that satisfies the requirement python-gst-1.0 (from versions: none)
ERROR: No matching distribution found for python-gst-1.0
$ sudo pip3 install python-gst-1.0 python-opencv
The directory '/home/t/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/t/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting python-gst-1.0
Exception:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 342, in run
requirement_set.prepare_files(finder)
File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 554, in _prepare_file
require_hashes
File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 278, in populate_link
self.link = finder.find_requirement(self, upgrade)
File "/usr/lib/python3/dist-packages/pip/index.py", line 465, in find_requirement
all_candidates = self.find_all_candidates(req.name)
File "/usr/lib/python3/dist-packages/pip/index.py", line 423, in find_all_candidates
for page in self._get_pages(url_locations, project_name):
File "/usr/lib/python3/dist-packages/pip/index.py", line 568, in _get_pages
page = self._get_page(location)
File "/usr/lib/python3/dist-packages/pip/index.py", line 683, in _get_page
return HTMLPage.get_page(link, session=self.session)
File "/usr/lib/python3/dist-packages/pip/index.py", line 795, in get_page
resp.raise_for_status()
File "/usr/share/python-wheels/requests-2.18.4-py2.py3-none-any.whl/requests/models.py", line 935, in raise_for_status
raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://pypi.org/simple/python-gst-1-0/
答案1
当安装错误版本的python-opencv.有一个适用于 Python 2 的版本和一个适用于 Python 3 的版本。使用适用于 Python 3 的版本：
sudo apt-get install python3-opencv
sudo apt-get install python3-gst-1.0