How about the experience? Did you test xcp-ng 8.3 Beta?

now i did a frech installation on a fresh debian 10 and got the same results. i installed xo with the following command:
sudo curl https://raw.githubusercontent.com/Jarli01/xenorchestra_installer/master/xo_install.sh | bash

I also tested a fresh installation on Ubuntu 18.04. I will check if i have the same problem on Debian 10.

@olivierlambert

Just before the click on the partition i started journalctl -u xo-server -f -n 50

root@XOCE:~# journalctl -u xo-server -f -n 50
-- Logs begin at Wed 2019-05-29 07:19:50 CEST. --
Aug 13 09:28:17 XOCE xo-server[31699]:   target:
Aug 13 09:28:17 XOCE xo-server[31699]:    WebSocket {
Aug 13 09:28:17 XOCE xo-server[31699]:      domain: null,
Aug 13 09:28:17 XOCE xo-server[31699]:      _events: {},
Aug 13 09:28:17 XOCE xo-server[31699]:      _eventsCount: 0,
Aug 13 09:28:17 XOCE xo-server[31699]:      _maxListeners: undefined,
Aug 13 09:28:17 XOCE xo-server[31699]:      readyState: 3,
Aug 13 09:28:17 XOCE xo-server[31699]:      protocol: '',
Aug 13 09:28:17 XOCE xo-server[31699]:      _binaryType: 'nodebuffer',
Aug 13 09:28:17 XOCE xo-server[31699]:      _closeFrameReceived: false,
Aug 13 09:28:17 XOCE xo-server[31699]:      _closeFrameSent: false,
Aug 13 09:28:17 XOCE xo-server[31699]:      _closeMessage: '',
Aug 13 09:28:17 XOCE xo-server[31699]:      _closeTimer: null,
Aug 13 09:28:17 XOCE xo-server[31699]:      _closeCode: 1006,
Aug 13 09:28:17 XOCE xo-server[31699]:      _extensions: {},
Aug 13 09:28:17 XOCE xo-server[31699]:      _receiver: null,
Aug 13 09:28:17 XOCE xo-server[31699]:      _sender: null,
Aug 13 09:28:17 XOCE xo-server[31699]:      _socket: null,
Aug 13 09:28:17 XOCE xo-server[31699]:      _isServer: false,
Aug 13 09:28:17 XOCE xo-server[31699]:      _redirects: 0,
Aug 13 09:28:17 XOCE xo-server[31699]:      url: 'ws://localhost:9001',
Aug 13 09:28:17 XOCE xo-server[31699]:      _req: null },
Aug 13 09:28:17 XOCE xo-server[31699]:   type: 'error',
Aug 13 09:28:17 XOCE xo-server[31699]:   message: 'connect ECONNREFUSED 127.0.0.1:9001',
Aug 13 09:28:17 XOCE xo-server[31699]:   error:
Aug 13 09:28:17 XOCE xo-server[31699]:    { Error: connect ECONNREFUSED 127.0.0.1:9001
Aug 13 09:28:17 XOCE xo-server[31699]:     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1191:14)
Aug 13 09:28:17 XOCE xo-server[31699]:      errno: 'ECONNREFUSED',
Aug 13 09:28:17 XOCE xo-server[31699]:      code: 'ECONNREFUSED',
Aug 13 09:28:17 XOCE xo-server[31699]:      syscall: 'connect',
Aug 13 09:28:17 XOCE xo-server[31699]:      address: '127.0.0.1',
Aug 13 09:28:17 XOCE xo-server[31699]:      port: 9001,
Aug 13 09:28:17 XOCE xo-server[31699]:      [Symbol(originalCallSite)]: [ CallSite {} ],
Aug 13 09:28:17 XOCE xo-server[31699]:      [Symbol(mutatedCallSite)]: [ CallSite {} ] } }
Aug 13 09:28:17 XOCE xo-server[31699]: xo-server-cloud: next attempt in 973 ms
Aug 13 09:28:18 XOCE xo-server[31699]: xo-server-cloud: next attempt in 1019 ms
Aug 13 09:28:19 XOCE xo-server[31699]: xo-server-cloud: next attempt in 2067 ms
Aug 13 09:28:21 XOCE xo-server[31699]: xo-server-cloud: next attempt in 3095 ms
Aug 13 09:28:24 XOCE xo-server[31699]: xo-server-cloud: next attempt in 5121 ms
Aug 13 09:28:29 XOCE xo-server[31699]: xo-server-cloud: next attempt in 7906 ms
Aug 13 09:28:37 XOCE xo-server[31699]: xo-server-cloud: next attempt in 13166 ms
Aug 13 09:28:50 XOCE xo-server[31699]: xo-server-cloud: next attempt in 20079 ms
Aug 13 09:29:10 XOCE xo-server[31699]: xo-server-cloud: next attempt in 32386 ms
Aug 13 09:29:43 XOCE xo-server[31699]: xo-server-cloud: next attempt in 55447 ms
Aug 13 09:29:59 XOCE ntfs-3g[38727]: Version 2017.3.23 integrated FUSE 28
Aug 13 09:29:59 XOCE ntfs-3g[38727]: Mounted /dev/loop0 (Read-Only, label "", NTFS 3.1)
Aug 13 09:29:59 XOCE ntfs-3g[38727]: Cmdline options: ro,norecovery
Aug 13 09:29:59 XOCE ntfs-3g[38727]: Mount options: ro,norecovery,allow_other,nonempty,relatime,fsname=/dev/loop0,blkdev,blksize=4096
Aug 13 09:29:59 XOCE ntfs-3g[38727]: Ownership and permissions disabled, configuration type 7
Aug 13 09:29:59 XOCE ntfs-3g[38727]: Unmounting /dev/loop0 ()
Aug 13 09:30:19 XOCE ntfs-3g[38750]: Version 2017.3.23 integrated FUSE 28
Aug 13 09:30:19 XOCE ntfs-3g[38750]: Mounted /dev/loop0 (Read-Only, label "", NTFS 3.1)
Aug 13 09:30:19 XOCE ntfs-3g[38750]: Cmdline options: ro,norecovery
Aug 13 09:30:19 XOCE ntfs-3g[38750]: Mount options: ro,norecovery,allow_other,nonempty,relatime,fsname=/dev/loop0,blkdev,blksize=4096
Aug 13 09:30:19 XOCE ntfs-3g[38750]: Ownership and permissions disable