First of all: when someone giving you directions writes a line that starts
with "$ ", it means "what comes after should be entered in a terminal as a
regular user". The dollar sign followed by a space is called a prompt. The
terminal shows it when ready to execute a command. Do not type that dollar
sign.
Here we have an error message:
nautilus: error while loading shared libraries:
libunity-protocol-private.so.0: cannot open shared object file: No such file
or directory
It looks like you do not have the package "libunity-protocol-private0"
installed. That is not normal. Nautilus (and Shotwell, and Liferea, and Deja
Dup, and ...) depends on this package through "libunity9". You can use the
"Synaptic package manager" to confirm whether those libraries are installed.
If they are, your disk is probably dying! If not, then you can try to install
the meta-packages "trisquel" and "trisquel-recommended" that actually define
Trisquel's default system.
However, one more time, whoever installed your system may not be trustworthy
and you may want to backup your data reinstall Trisquel 7 from its live
medium.
