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Mint 19.2

disable kdb backlight to avoid lockup at boot:
ln -s /dev/null /var/lib/systemd/backlight/platform-dell-laptop\:leds\:dell\:\:kbd_backlight

It's actually this command, but I did not manage to mount up the system for systemctl to work:
sudo systemctl mask systemd-backlight@leds\:dell\:\:kbd_backlight.service

For wifi to work the Broadcom 3rd party driver install is needed (broadcom, what did you expect? - closed drivers..)

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Install ssmtp

/usr/local/etc/ssmtp/ssmtp.conf:
root=destination@gmail.com
mailhub=smtp.gmail.com:587
AuthUser=useracc@gmail.com
AuthPass=userpass
UseSTARTTLS=YES

rc.conf:

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yum install ssmtp

/etc/ssmtp/ssmtp.conf:
TLS_CA_FILE=/etc/pki/tls/certs/ca-bundle.crt
root=useracc@gmail.com
mailhub=smtp.gmail.com:587
AuthUser=useracc@gmail.com
AuthPass=userpass
UseSTARTTLS=YES
UseTLS=Yes

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Under File Storage -> Run a command
/etc/motioneye/convert.sh %f

convert.sh:

#!/bin/bash

FILEPATH="$1"
TMPPATH=$(mktemp).mp4

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ffmpeg -i inputfile.mkv -codec copy outputfile.mp4

ffmpeg -i inputfile.mkv -codec copy -c:a aac outputfile.mp4

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ffmpeg -i chunkies.m3u8 -codec copy output.mp4

If TS:
for file in $(cat chunks.m3u8 ); do cat $file.ts >> all.ts ; done
ffmpeg -i all.ts -acodec copy -vcodec copy all.mp4

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curl -sSL https://install.pi-hole.net | bash

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OctoPi:

network={
 ssid="Your Wifi SSID"
 psk="supersecretwifipassword"
}
==========================================================
RASPBIAN:
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

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Prusa Mesh Level (didn't change - used default):

G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
G81 ; check mesh leveling results

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old kernels:
Vanila:
## dnf repoquery set negative --latest-limit ##
## as how many old kernels you want keep ##
dnf remove $(dnf repoquery --installonly --latest-limit=-2 -q)

YUM-UTILS:
## CentOS, Red Hat (RHEL) ##
yum install yum-utils