My tftp server stopped working. I don't know why. I tried re-installation of tftpd-hpa, I tried to install another server: atftpd in its place.
They don't function.(Debian Squeeze)
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HPA's tftpd: in.tftpd/usr/sbin/in.tftpd: unrecognized option '--address'

Starting HPA's tftpd: in.tftpdinvoke-rc.d: initscript tftpd-hpa, action "start" failed.
dpkg: error processing tftpd-hpa (--configure):
subprocess installed post-installation script returned error exit status 71
Errors were encountered while processing: tftpd-hpa
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Setting up atftpd (0.7.dfsg-9.1) ...
dpkg: error processing atftpd (--configure):
subprocess installed post-installation script returned error exit status 1
configured to not write apport reports
Errors were encountered while processing: atftpd
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Removing the ltsp-server-standalone makes removing of atftpd AND tftpd-hpa possible.

Then I installed tftpd-hpa and ltsp-server-standalone
again, now mine tftp-server is up and running again.

Strange . . .