Resolved After switching from qmail to postfix big problem

[Ankebut]

Hello,
after i switch from qmail to postfix have get error, and now i try install again qmail or postfix and i get error please help, here is error log:

Installation started in background
Checking whether the package dependencies are resolved.
Installing packages
Reading package lists...
Building dependency tree...
Reading state information...
The following NEW packages will be installed:
plesk-mail-qc-driver psa-qmail psa-qmail-rblsmtpd
0 upgraded, 3 newly installed, 0 to remove and 1 not upgraded.
Need to get 952 kB of archives.
After this operation, 5429 kB of additional disk space will be used.
Get:1 http://autoinstall.plesk.com/debian/PSA_17.8.11/ jessie/all psa-qmail amd64 3:1.03-debian8.0.build1708180220.17 [339 kB]
Get:2 http://autoinstall.plesk.com/debian/PSA_17.8.11/ jessie/all psa-qmail-rblsmtpd amd64 0.88-debian8.0.build1708171004.18 [19.9 kB]
Get:3 http://autoinstall.plesk.com/debian/PSA_17.8.11/ jessie/all plesk-mail-qc-driver amd64 17.8.11-debian8.0.build1708180301.19 [593 kB]
Fetched 952 kB in 0s (8841 kB/s)
dpkg: unrecoverable fatal error, aborting:
unknown group 'postdrop' in statoverride file
E: Sub-process /usr/bin/dpkg returned an error code (2)
Error: An error occurred on attempt to install packages.
Attention! Your software might be inoperable.
Please contact product technical support.

 

[IgorG]

Do you have postdrop in /etc/group file?
Check it with

# grep postdrop /etc/group
postdrop:x:120:

 

[Ankebut]

root@server / # grep postdrop /etc/group postdrop:x:120:

grep: postdrop:x:120:: No such file or directory

root@server / #

 

[IgorG]

Correct command should be

grep postdrop /etc/group

 

[Ankebut]

root@server / # grep postdrop /etc/group

root@server / # grep postdrop /etc/group

root@server / #

after enter is empty

 

[IgorG]

Add this group with

/usr/sbin/groupadd postdrop

and try to change mailserver to postfix again.

 

[Ankebut]

very thx now all it working