RaspiBolt Guide done till "Lightning" now Read-only?

I suddenly get the error that file system is read-only. But everything worked out before:

rm: cannot remove '/home/admin/download/bitcoin-0.17.1/lib/libbitcoinconsensus.so.0.0.0': Read-only file system

Also same when I try to install something:

wget https://github.com/lightningnetwork/lnd/releases/download/v0.5-beta/lnd-linux-armv7-v0.5-beta.tar.gz

(...)

Cannot write to ‘lnd-linux-armv7-v0.5-beta.tar.gz’ (Read-only file system).

anyone an idea?

I used this guide: https://github.com/Stadicus/guides/blob/master/raspibolt/raspibolt_40_lnd.md

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