You have to cd into the App-perlbrew directory. To install perlbrew the first time on the machine, do the following: 

$ git clone https://some.valid.perlbrew.url/
$ cd App-perlbrew
$ perl perlbrew self-install 
$ perlbrew init

[download]
IIRC, if this is the very first time initializing perlbrew, you will need to use system perl to run the script. Once perlbrew is running, you should be able to just run: 
 
$ cd App-perlbrew
$ git pull
$ perlbrew self-upgrade
$ perlbrew init

[download]
I've never had any problems, but since your perlbrew is already in git, you can go back to an older version if necessary.

In reply to Re^2: perlbrew/curl: curl: (60) Peer certificate cannot be authenticated with known CA certificates by thechartist
in thread [SOLVED]: perlbrew/curl: curl: (60) Peer certificate cannot be authenticated with known CA certificates by Perl300

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