Oh, ok: just go to /etc/opkg where is new distfeeds file called distfeeds.conf.new, ...
Omega2(+) out of the box v0.1.10-b160: the '/etc/opkg/distfeeds.conf' and '/etc/opkg/distfeeds.conf.new' are fully identical files.
You renamed 'distfeeds.conf.new' to 'distfeeds.conf' so you have got a factory default 'distfeeds.conf' file
where the '#src/gz reboot_onion ...' line is disabled by default
due to after opkg update that error message gone
but that 'lede-project.org/releases/17.01-SNAPSHOT/packages/mipsel_24kc/onion/Packages.gz' repo is missing of course.