Seeing these errors at the end of the build process is expected. They happen at a time where the system being built (Tails) is configured to fetch packages through Tor; but as it is not Tails that is actually running, refreshing the package list fails.

Thank you for your reply. I have also errors like these:

Cannot stat sortlist entry "live/overlay/var/run/utmp" This is probably because you're using the wrong file path relative to the source directories Cannot stat sortlist entry "etc/init.d/live" This is probably because you're using the wrong file path relative to the source directories Cannot stat sortlist entry "live/overlay/var/log/wtmp" This is probably because you're using the wrong file path relative to the source directories

and some errors

ERROR: ld.so: object '/usr/lib/libeatmydata/libeatmydata.so' from LD_PRELOAD cannot be preloaded: ignored. ERROR: ld.so: object '/usr/lib/libeatmydata/libeatmydata.so' from LD_PRELOAD cannot be preloaded: ignored. ERROR: ld.so: object '/usr/lib/libeatmydata/libeatmydata.so' from LD_PRELOAD cannot be preloaded: ignored.

Are they expected ?

Both are harmless, yes. The first is related to ?improve boot time on cd.