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I am not a Linux expert, so it took me some time to configure my mining rig on Ubuntu 18.04 with NVIDIA GeForce GTX 1060 3GB, and I wrote down all the steps I did:

First I installed NVIDIA driver, but OpenCL did not install automatically with it and I installed it manually with the following command:

sudo apt install -y ocl-icd-libopencl1

Then I installed CURL:

sudo apt install -y libcurl3

not ‘curl’ and not ‘libcurl4’ packages, otherwise the miner will fail to start reporting the following error message:

./ethdcrminer64: /usr/lib/x86_64-linux-gnu/libcurl.so.4: version `CURL_OPENSSL_3' not found (required by ./ethdcrminer64)

When I made the miner work with one video card I connected four cards and tried to boot the machine, but something interesting started to happen. The machine started to boot and system logs (syslog and kern.log in /var/log directory) started to grow quickly to 3GB and more, but UI did not appear and SSH did now work until I turned ‘Gen1’ option on in BIOS along with ‘Above 4G decoding’ that was already turned on.

Then I created file miner.service in /etc/systemd/system folder:

[Unit]
Description=Claymore miner After=network.target

[Service]
User=izam
Group=izam
WorkingDirectory=/home/izam/miners/claymore

Type=simple
ExecStart=/home/izam/miners/claymore/ethdcrminer64 -epool eth-eu1.nanopool.org:9999 -ewal <my wallet>.rig3/<my email> -epsw x -mode 1 -ftime 10

[Install]
WantedBy=multi-user.target

and started the service:

sudo systemctl enable miner.service
sudo service miner start
#To reload the configuration:
sudo systemctl daemon-reload
#To see the output:
sudo journalctl -u miner.service

X + GNOME consume 56 + 68 + 2 = 126MB of VRAM:

So I found a way how to disable X:

in /etc/default/grub I replaced

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

with

GRUB_CMDLINE_LINUX_DEFAULT="text"

updated GRUB:

sudo update-grub

and set multi-user.target as the default target:

sudo systemctl get-default

graphical.target

#sudo systemctl enable multi-user.target --force
sudo systemctl set-default multi-user.target

Created symlink /etc/systemd/system/default.target → /lib/systemd/system/multi-user.target.

sudo reboot

now I can either start X manually with

startx

or enable X back with

sudo systemctl set-default graphical.target
sudo reboot

Without X and GNOME no additional VRAM is consumed:

Now I have the rig with 8 cards (click on the image to see it full size):

it is not clear how to overclock the cards without X, and it is a bit strange that two cards give 15+ Mh/s while others give 19+ Mh/s.

The memory consumption with 8 cards is still as low as possible (a small difference is explained by the new DAG epoch):

On my second rig with the same hardware, four cards give 15+ Mh/s:

and it is not clear yet how to fix this.