It gives the same error. 
Info: Installing the app 'calibreweb'… Warning: /bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) Info: [....................] > Validating installation parameters... Info: [+...................] > Storing installation settings... Info: [#...................] > Opening port 8083... Info: [#+..................] > Downloading sources to /var/www/calibreweb... Info: [##++................] > Installing package dependencies... Warning: /usr/share/yunohost/helpers.d/apt: line 95: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) Warning: /usr/share/yunohost/helpers.d/apt: line 162: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) Warning: /usr/share/yunohost/helpers.d/apt: line 95: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) Info: [####++++++..........] > Installing pip requirements... Warning: Exception: Warning: Traceback (most recent call last): Warning: File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 594, in urlopen Warning: chunked=chunked) Warning: File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 391, in _make_request Warning: six.raise_from(e, None) Warning: File "<string>", line 2, in raise_from Warning: File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 387, in _make_request Warning: httplib_response = conn.getresponse() Warning: File "/usr/lib/python3.5/http/client.py", line 1198, in getresponse Warning: response.begin() Warning: File "/usr/lib/python3.5/http/client.py", line 297, in begin Warning: version, status, reason = self._read_status() Warning: File "/usr/lib/python3.5/http/client.py", line 266, in _read_status Warning: raise RemoteDisconnected("Remote end closed connection without" Warning: http.client.RemoteDisconnected: Remote end closed connection without response Warning: Warning: During handling of the above exception, another exception occurred: Warning: Warning: Traceback (most recent call last): Warning: File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 215, in main Warning: status = self.run(options, args) Warning: File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 342, in run Warning: requirement_set.prepare_files(finder) Warning: File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 380, in prepare_files Warning: ignore_dependencies=self.ignore_dependencies)) Warning: File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 554, in _prepare_file Warning: require_hashes Warning: File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 278, in populate_link Warning: self.link = finder.find_requirement(self, upgrade) Warning: File "/usr/lib/python3/dist-packages/pip/index.py", line 465, in find_requirement Warning: all_candidates = self.find_all_candidates(req.name) Warning: File "/usr/lib/python3/dist-packages/pip/index.py", line 423, in find_all_candidates Warning: for page in self._get_pages(url_locations, project_name): Warning: File "/usr/lib/python3/dist-packages/pip/index.py", line 568, in _get_pages Warning: page = self._get_page(location) Warning: File "/usr/lib/python3/dist-packages/pip/index.py", line 683, in _get_page Warning: return HTMLPage.get_page(link, session=self.session) Warning: File "/usr/lib/python3/dist-packages/pip/index.py", line 792, in get_page Warning: "Cache-Control": "max-age=600", Warning: File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 501, in get Warning: return self.request('GET', url, **kwargs) Warning: File "/usr/lib/python3/dist-packages/pip/download.py", line 386, in request Warning: return super(PipSession, self).request(method, url, *args, **kwargs) Warning: File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 488, in request Warning: resp = self.send(prep, **send_kwargs) Warning: File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 609, in send Warning: r = adapter.send(request, **kwargs) Warning: File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/adapters.py", line 423, in send Warning: timeout=timeout Warning: File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 643, in urlopen Warning: _stacktrace=sys.exc_info()[2]) Warning: File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/util/retry.py", line 315, in increment Warning: total -= 1 Warning: TypeError: unsupported operand type(s) for -=: 'Retry' and 'int' Warning: Error: Could not install calibreweb: An error occurred inside the app installation script Info: The operation 'Install the 'calibreweb' app' could not be completed. Please share the full log of this operation using the command 'yunohost log display 20200503-184610-app_install-calibreweb --share' to get help Warning: Here's an extract of the logs before the crash. It might help debugging the error: Info: WARNING - page = self._get_page(location) Info: WARNING - File "/usr/lib/python3/dist-packages/pip/index.py", line 683, in _get_page Info: WARNING - return HTMLPage.get_page(link, session=self.session) Info: WARNING - File "/usr/lib/python3/dist-packages/pip/index.py", line 792, in get_page Info: WARNING - "Cache-Control": "max-age=600", Info: WARNING - File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 501, in get Info: WARNING - return self.request('GET', url, **kwargs) Info: WARNING - File "/usr/lib/python3/dist-packages/pip/download.py", line 386, in request Info: WARNING - return super(PipSession, self).request(method, url, *args, **kwargs) Info: WARNING - File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 488, in request Info: WARNING - resp = self.send(prep, **send_kwargs) Info: WARNING - File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 609, in send Info: WARNING - r = adapter.send(request, **kwargs) Info: WARNING - File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/adapters.py", line 423, in send Info: WARNING - timeout=timeout Info: WARNING - File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 643, in urlopen Info: WARNING - _stacktrace=sys.exc_info()[2]) Info: WARNING - File "/usr/share/python-wheels/urllib3-1.19.1-py2.py3-none-any.whl/urllib3/util/retry.py", line 315, in increment Info: WARNING - total -= 1 Info: WARNING - TypeError: unsupported operand type(s) for -=: 'Retry' and 'int' Info: DEBUG - + ynh_exit_properly Warning: Removing the app following the installation failure… Warning: /bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) Info: [++..................] > Loading installation settings... Info: [##+.................] > Stopping and removing the systemd service... Info: [###++++.............] > Removing Dependencies... Warning: /usr/share/yunohost/helpers.d/apt: line 95: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) Info: [#######+............] > Removing /var/www/calibreweb... Info: [########............] > Removing nginx web server configuration... Info: '/etc/nginx/conf.d/amloq.nohost.me.d/calibreweb.conf' wasn't deleted because it doesn't exist. Info: [########+...........] > Removing logrotate configuration... Info: [#########++++++++...] > Closing port 8083... Warning: [WARN] Not deleting '/var/log/calibreweb/' because it is not an acceptable path to delete. Info: [#################...] > Removing log file... Warning: [WARN] The user calibreweb was not found Info: [#################+..] > Removing the dedicated system user... Warning: [WARN] !!!The library folder was not deleted. Delete it manually if required!!! Info: [####################] > Removal of calibreweb completed Error: The operation 'Install the 'calibreweb' app' could not be completed. Please share the full log of this operation using the command 'yunohost log display 20200503-184610-app_install-calibreweb --share' to get help