/usr/share/resolvconf/dump-debug-info is in resolvconf 1.79ubuntu10.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #!/bin/sh
dump_dir()
{
echo "### ls -l $1"
ls -l "$1" || :
for F in "$1"/* ; do
[ -f "$F" ] || continue
echo "### cat $F"
cat "$F"
done
}
echo "###### Start of debugging information for resolvconf ######"
dump_dir /etc/resolvconf
dump_dir /etc/resolvconf/resolv.conf.d
echo "### ls -l /run/resolvconf"
dump_dir /run/resolvconf
dump_dir /run/resolvconf/interface
echo "### ls -l /etc/resolv.conf"
ls -l /etc/resolv.conf || :
echo "### lsattr /etc/resolv.conf"
which lsattr >/dev/null 2>&1 && lsattr /etc/resolv.conf || :
echo "### cat /etc/resolv.conf"
cat /etc/resolv.conf || :
echo "### cat /etc/NetworkManager/NetworkManager.conf"
cat /etc/NetworkManager/NetworkManager.conf || :
echo "###### End of debugging information for resolvconf ######"
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