it was always the proftpd-core config problem
the following solved it for me:
sudo apt remove proftpd*
sudp apt purge proftpd*
sudo apt-get install proftpd*
sudo service proftpd start
proftpd.service - ProFTPD FTP Server
Loaded: loaded (/lib/systemd/system/proftpd.service; enabled; vendor
preset: enabled)
Active: active (running) since Mon 2021-07-19 12:53:36 +07; 9min ago
Main PID: 12406 (proftpd)
Tasks: 1 (limit: 4632)
Memory: 4.1M
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https://bugs.launchpad.net/bugs/1933318
Title:
package proftpd-core 1.3.7a+dfsg-12 failed to install/upgrade:
installed proftpd-core package post-installation script subprocess
returned error exit status 1
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