yii2-adminlte-asset | AdminLTE Asset Bundle for Backend Theme in Yii2 Framework | Dashboard library

Apparently, you don't have permissions to write to ./composer.json

You have 2 ways to fix this. Either give write permissions to the user or the group to that user by running chmod XXX composer.json or you can change the owner of the file to the user which composer is using(He probably has those permissions already).

The XXX above should be numbers. You can read here what those numbers are supposed to be, but you probably want something like a 660 or a 770.

Some people might use 777 to fix this issue, but this should !!NOT!! be used, as you do not want others to access files, unless they really need to.

You can change the owner of the file by using chown. It should look something like chown user:group composer.json.

Please, let me know if there is something that you do not understand and I will clarify, as I know it is hard to understand permissions as a new linux user.

Please note, that this is only for the last error, but handling the other errors is similar. You just need to give the user, which composer is using the right permissions for the right files and/or folders. You can use -R flag for handling directories.