Ça y est ! J’ai l’occassion d’expérimenter la solution de @tierce ! 
En effet, après avoir redémarré la brique, le hotspot et le vpn était de nouveau en rideau.
J’ai réinstallé les deux en suivant la procédure plus haut
yunohost app remove vpnclient yunohost app remove hotspot cd root wget https://gist.githubusercontent.com/tbalthazar/a0aa22ef53e3dcf6c9133a6304b03cab/raw/4fa4820b4c4750472d7abd24733522b573452a6f/install-vpn-wifi.sh chmod +x install-vpn-wifi.sh ./install-vpn-wifi.sh
J’ai du réinstaller le hotspot indépendemment par la suite, ce qui est étonnant, vu que le script est censé prendre les deux en charges.
Autant le hotspot est opérationnel, autant le VPN reste
J’ai:
ynh-hotspot:
loaded: not-found
status: running
ynh-vpnclient:
loaded: not-found
status: inactive
Le service ne démarre pas :
sudo systemctl status ynh-vpnclient.service
● ynh-vpnclient.service - YunoHost VPN Client.
Loaded: loaded (/etc/systemd/system/ynh-vpnclient.service; enabled)
Active: failed (Result: exit-code) since Thu 2018-02-15 10:03:53 CET; 4min 9s ago
Process: 4379 ExecStart=/usr/local/bin/ynh-vpnclient start (code=exited, status=1/FAILURE)
Main PID: 4379 (code=exited, status=1/FAILURE)
Feb 15 10:03:24 michu.nohost.me ntpd[4461]: Listen normally on 5 eth0 fe...3
Feb 15 10:03:24 michu.nohost.me ntpd[4461]: Listen normally on 6 lo ::1 ...3
Feb 15 10:03:24 michu.nohost.me ntpd[4461]: Listen normally on 7 wlan0 f...3
Feb 15 10:03:24 michu.nohost.me ntpd[4461]: Listen normally on 8 eth0 2a...3
Feb 15 10:03:24 michu.nohost.me ntpd[4461]: Listen normally on 9 eth0 fe...3
Feb 15 10:03:24 michu.nohost.me ntpd[4461]: peers refreshed
Feb 15 10:03:24 michu.nohost.me ntpd[4461]: Listening on routing socket ...s
Feb 15 10:03:53 michu.nohost.me systemd[1]: ynh-vpnclient.service: main ...E
Feb 15 10:03:53 michu.nohost.me systemd[1]: Failed to start YunoHost VPN....
Quant au log :
sudo tail -n 100 /var/log/openvpn-client.log
Thu Feb 15 09:58:31 2018 OpenVPN 2.3.4 arm-unknown-linux-gnueabihf [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on Jun 26 2017
Thu Feb 15 09:58:31 2018 library versions: OpenSSL 1.0.1t 3 May 2016, LZO 2.08
Thu Feb 15 09:58:31 2018 WARNING: file '/etc/openvpn/keys/credentials' is group or others accessible
Thu Feb 15 09:58:31 2018 WARNING: file '/etc/openvpn/keys/user.key' is group or others accessible
Thu Feb 15 09:58:31 2018 Socket Buffers: R=[163840->131072] S=[163840->131072]
Thu Feb 15 09:58:31 2018 UDPv4 link local: [undef]
Thu Feb 15 09:58:31 2018 UDPv4 link remote: [AF_INET]80.67.181.3:1195
Thu Feb 15 09:58:31 2018 TLS: Initial packet from [AF_INET]80.67.181.3:1195, sid=484b0580 1c319ab0
Thu Feb 15 09:58:31 2018 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Thu Feb 15 09:58:32 2018 VERIFY OK: depth=1, C=BE, ST=Brussels Capital Region, L=Brussels, O=Neutrinet, OU=VPN, CN=vpn.neutrinet.be, name=VPN, emailAddress=contact@neutrinet.be
Thu Feb 15 09:58:32 2018 VERIFY OK: nsCertType=SERVER
Thu Feb 15 09:58:32 2018 Validating certificate key usage
Thu Feb 15 09:58:32 2018 ++ Certificate has key usage 00a0, expects 00a0
Thu Feb 15 09:58:32 2018 VERIFY KU OK
Thu Feb 15 09:58:32 2018 NOTE: --mute triggered...
Thu Feb 15 09:58:53 2018 4 variation(s) on previous 5 message(s) suppressed by --mute
Thu Feb 15 09:58:53 2018 event_wait : Interrupted system call (code=4)
Thu Feb 15 09:58:53 2018 SIGTERM received, sending exit notification to peer
Thu Feb 15 09:58:54 2018 SIGTERM[soft,exit-with-notification] received, process exiting
J’essaye de passer les commandes proposées par @tierce
sudo ip addr flush dev tun0
Device "tun0" does not exist.
sudo ip -6 addr flush dev tun0
Device "tun0" does not exist.
Bardaff, c’est l’embardée !