It can be downloaded at first, but it is a bit slow.
But after a while, this error occurred. I don’t know why?
pi@raspberrypi:~ $ sudo snap install nextcloud error: cannot perform the following tasks: - Download snap "core" (7274) from channel "stable" (stream error: stream ID 1;PROTOCOL_ERROR) pi@raspberrypi:~ $ sudo snap install nextcloud error: cannot perform the following tasks: - Download snap "core" (7274) from channel "stable" (Get https://fastly.cdn.snapcraft.io/download-origin/fastly/99T7MUlRhtI3U0QFgl5mXXESAiSwt776_7274.snap? token=1561881600_6b65a842b54b04f22799a5068e763ac5e80edc26: write on closed buffer) pi@raspberrypi:~ $ sudo snap install nextcloud error: cannot perform the following tasks: - Download snap "core" (7274) from channel "stable" (stream error: stream ID 1;PROTOCOL_ERROR) pi@raspberrypi:~$