Question: I am on Ubuntu 20.04 (not on ZFS). However, somehow I got this error: 

> 
> ERROR couldn't connect to zsys daemon: connection error: desc = "transport: Error while dialing dial unix /run/zsysd.sock: connect: connection refused"
> 
> 
> 

The error screenshot

[![enter image description here](https://i.stack.imgur.com/WwWa5.png)](https://i.stack.imgur.com/WwWa5.png)

Answer: 
Just restart zsysd.service, eveything will be Ok.
The command is `sudo systemctl restart zsysd.service`.
Because I have a dual-boot system I agree with the option of "comment out" zsys commands per above. I say this because one could attempt to install the ZFS file system (so I've read) to existing installs of Ubuntu 19.10 (and later?) to make the error go away, but according to the following article attempting to do so will wipe the whole drive, including other functioning partitions!

<https://itsfoss.com/zfs-ubuntu/>

Currently, I have a second partition on my dual-boot machine running Max OS 11.1 (Big Sur), and wouldn't want that to get wiped.

Finally, I did install of program before and after "comment out" of zsys commands per above and yes, the fix works! Before: same error as above. After: no error. fyi, this is the program I installed (a mail program):

```
sudo apt-get install sylpheed

```