read-only file system

[tembares]

Good day and thank you for reading my question.
My level of knowledge is medium. I never used docker, but I am using it because I am running Home Assistant.
Following the installation instructions, the
$ mkdir $HOME/.local/share/signal-cli
gave an error. At first I ignored it and went to the second step:
$ sudo docker run -d --name signal-api --restart=always -p 8080:8080 \ -v $HOME/.local/share/signal-cli:/home/.local/share/signal-cli \ -e 'MODE=native' bbernhard/signal-cli-rest-api
After downloading and extracting the error of the failed directory showed up. By trying it again, I found out how to remove a container in docker and docker rm signal-cli.

I created the folder mdir /home/.local./share/signal-cli as $HOME is [myname]. Still I received the error that the file-system is read-only.
I gave .local, share and signal-cli write rights for the group: chmod g+w. Also this had no success.

Does anyone has an advise how I can solve this issue?

Thank you in advance!