removing a file on a Linux server

Richard, you're in the wrong directory.

If you look closely at your image, the directory that contains the file you want to delete is not ~/apps. You were in that directory, but then you went up one directory with cd ..

The directory that contains the file you want to delete is your home directory (~).

You should be able to do this:

sudo rm -f ~/C:\xampp\php\logs\php_error_log

or to make it easy on yourself:

sudo rm -f ~/*php_error_log

Just a tip; most Linux distros will allow you to type "ll" instead of "ls -l" or "ls -la". It's really fast. Give it a shot.

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