What happens after apt-get update, do you get any error message? v-update-sys-hestia-all works properly here, so it looks like it is a local issue on your system.
Also you didnt share either the hestia version nor the os and version you’re running!
Reading package lists... Done
Building dependency tree
Reading state information... Done
hestia is already the newest version (1.1.1).
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
root@srv:~#
Hmm, can’t say why it fails, that’s weird. Currently you can disable autoupdate, to prevent the emails, but I can’t say what would be the way to solve this.