Merhaba, yeni aldığım sunucuya(debian11) yunohost kurmak istedim. Yunohostu kurarken kurulumda hata verdi. daha sonra hiç bir işlem yaptırmamaya başladı. apt upgrade yaparken bile

postconf: warning: valid_hostname: numeric hostname: **.**.**.**
postconf: fatal: unable to use my own hostname
Use of uninitialized value $destinations in scalar chomp at /var/lib/dpkg/info/postfix.config line 223.
Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/Client/ConfModule.pm line 121.
postconf: warning: valid_hostname: numeric hostname: **.**.**.**
postconf: fatal: unable to use my own hostname
Use of uninitialized value $mynetworks in scalar chomp at /var/lib/dpkg/info/postfix.config line 287.
Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/Client/ConfModule.pm line 121.
postconf: warning: valid_hostname: numeric hostname: **.**.**.**
postconf: fatal: unable to use my own hostname
Use of uninitialized value $protos in scalar chomp at /var/lib/dpkg/info/postfix.config line 389.
Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/Client/ConfModule.pm line 121.
postconf: warning: valid_hostname: numeric hostname: **.**.**.**
postconf: fatal: unable to use my own hostname
postconf: warning: valid_hostname: numeric hostname: **.**.**.**
postconf: fatal: unable to use my own hostname
dpkg: error processing package postfix (--configure):
 installed postfix package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 postfix
E: Sub-process /usr/bin/dpkg returned an error code (1)

böyle bir hata alıyorum.
Lütfen bilen biri varsa yardım edin. Okuduğum kaynakların hiç biri işime yaramadı. Format hakkım kalmayacak VDS imde.