Yes, i have the same ‘issue’ here using another backend (dvblogic).
In my case, it takes a couple of retries installing (like you described), after which it is correctly installed.
To avoid this error on reboot i had to set a dhcp reserved address to be assigned (vs static ip) AND set kodi to wait for network ( for 5 seconds). This works around it nicely.
Not sure if this is relevant, I had problems with my tvheadend on my NUC. I uninstalled the backend, & client, rebooted, then ran the addon kcleaner. I was then able to install tvh again.
Failing that, try deleting the pvr files via ssh. (I use ftpcore lite)
Thanks guys, the vu client is working like a charm right now! Now I am searching for a way to get the vu client talk to my enigma receiver outside my Lan network for when I am travelling and bringing my libreElec device with me.
Since upgrading this year my enigma receiver with the newest openatv images I found out that openatv prohibited it reaching the receiver in wan through standard openwebif (like it used to do earlier) due to unsafety reasons of the receiver being taken over. Now you need to use a VPN to be able to talk to your receiver in WAN i guess, but this is probably material for another thread/forum. Anyway thanks and good to know that this vu client issue was not libreElec related.