pi@raspberrypi:~ $ sudo apt full-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  rpi-eeprom-images
Use 'sudo apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up postfix (3.4.10-0+deb10u1) ...

Postfix (main.cf) configuration was not changed.  If you need to make changes,
edit /etc/postfix/main.cf (and others) as needed.  To view Postfix
configuration values, see postconf(1).

After modifying main.cf, be sure to run 'service postfix reload'.

Running newaliases
newaliases: warning: valid_hostname: numeric hostname: 8.8.8.8
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 8.8.8.8
dpkg: error processing package postfix (--configure):
 installed postfix package post-installation script subprocess returned error exit status 75
Errors were encountered while processing:
 postfix
E: Sub-process /usr/bin/dpkg returned an error code (1)
pi@raspberrypi:~ $ sudo apt update
Hit:1 http://archive.raspberrypi.org/debian buster InRelease
Hit:2 http://raspbian.raspberrypi.org/raspbian buster InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
pi@raspberrypi:~ $ curl -sSL https://github.com/OpenMediaVault-Plugin-Developers/installScript/raw/master/install | sudo bash
Current / permissions = 755
New / permissions = 755
Updating repos before installing...
Hit:1 http://archive.raspberrypi.org/debian buster InRelease
Hit:2 http://raspbian.raspberrypi.org/raspbian buster InRelease
Reading package lists... Done
Installing lsb_release...
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  rpi-eeprom-images
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0 B/27.8 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 93960 files and directories currently installed.)
Preparing to unpack .../lsb-release_10.2019051400+rpi1_all.deb ...
Unpacking lsb-release (10.2019051400+rpi1) over (10.2019051400+rpi1) ...
Setting up postfix (3.4.10-0+deb10u1) ...

Postfix (main.cf) configuration was not changed.  If you need to make changes,
edit /etc/postfix/main.cf (and others) as needed.  To view Postfix
configuration values, see postconf(1).

After modifying main.cf, be sure to run 'service postfix reload'.

Running newaliases
newaliases: warning: valid_hostname: numeric hostname: 8.8.8.8
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 8.8.8.8
dpkg: error processing package postfix (--configure):
 installed postfix package post-installation script subprocess returned error exit status 75
Setting up lsb-release (10.2019051400+rpi1) ...
Processing triggers for man-db (2.8.5-2) ...
Errors were encountered while processing:
 postfix
E: Sub-process /usr/bin/dpkg returned an error code (1)
usul :: 5
Adding Debian signing keys...
Executing: /tmp/apt-key-gpghome.1gCVY6PydK/gpg.1.sh --no-tty --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys AA8E81B4331F7F50
gpg: key EDA0D2388AE22BA9: "Debian Security Archive Automatic Signing Key (9/stretch) <ftpmaster@debian.org>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1
Executing: /tmp/apt-key-gpghome.tqzqwNDujf/gpg.1.sh --no-tty --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 112695A0E562B32A
gpg: key 4DFAB270CAA96DFA: "Debian Security Archive Automatic Signing Key (10/buster) <ftpmaster@debian.org>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1
Executing: /tmp/apt-key-gpghome.w5mqjHbaXG/gpg.1.sh --no-tty --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 04EE7237B7D453EC
gpg: key E0B11894F66AEC98: "Debian Archive Automatic Signing Key (9/stretch) <ftpmaster@debian.org>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1
Executing: /tmp/apt-key-gpghome.YUXAxO9Dbu/gpg.1.sh --no-tty --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 648ACFD622F3D138
gpg: key DC30D7C23CBBABEE: "Debian Archive Automatic Signing Key (10/buster) <ftpmaster@debian.org>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1
Install prerequisites...
Reading package lists... Done
Building dependency tree
Reading state information... Done
dirmngr is already the newest version (2.2.12-1+rpi1+deb10u1).
gnupg is already the newest version (2.2.12-1+rpi1+deb10u1).
The following package was automatically installed and is no longer required:
  rpi-eeprom-images
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up postfix (3.4.10-0+deb10u1) ...

Postfix (main.cf) configuration was not changed.  If you need to make changes,
edit /etc/postfix/main.cf (and others) as needed.  To view Postfix
configuration values, see postconf(1).

After modifying main.cf, be sure to run 'service postfix reload'.

Running newaliases
newaliases: warning: valid_hostname: numeric hostname: 8.8.8.8
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 8.8.8.8
dpkg: error processing package postfix (--configure):
 installed postfix package post-installation script subprocess returned error exit status 75
Errors were encountered while processing:
 postfix
E: Sub-process /usr/bin/dpkg returned an error code (1)
Installing openmediavault required packages...
Reading package lists... Done
Building dependency tree
Reading state information... Done
postfix is already the newest version (3.4.10-0+deb10u1).
The following package was automatically installed and is no longer required:
  rpi-eeprom-images
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up postfix (3.4.10-0+deb10u1) ...

Postfix (main.cf) configuration was not changed.  If you need to make changes,
edit /etc/postfix/main.cf (and others) as needed.  To view Postfix
configuration values, see postconf(1).

After modifying main.cf, be sure to run 'service postfix reload'.

Running newaliases
newaliases: warning: valid_hostname: numeric hostname: 8.8.8.8
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 8.8.8.8
dpkg: error processing package postfix (--configure):
 installed postfix package post-installation script subprocess returned error exit status 75
Errors were encountered while processing:
 postfix
E: Sub-process /usr/bin/dpkg returned an error code (1)
failed installing postfix
pi@raspberrypi:~ $