Missing php5-json

[kllr]

I am trying to run the phoronix test suite on a laptop using a USB live ubuntu OS. I am unable to install php5-json which is needed to run the phoronix test suite. I have installed php5 using apt-get, but when I run " phoronix-test-suite list-tests" I get the error below:

--start error text ---------------------
The following PHP extensions are REQUIRED by the Phoronix Test Suite:

JSON PHP JSON support is required for OpenBenchmarking.org communication.

The following PHP extensions are OPTIONAL but recommended:

PCNTL PHP PCNTL is highly recommended as it is required by some tests.
PHP FPDF PHP FPDF is recommended if wishing to generate PDF reports.
--stop error text ---------------------


When I try to install php5 using the command "sudo apt-get install php5-cli php5-json php5-gd" I get the following error:

--start error text ---------------------
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package php5-json is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'php5-json' has no installation candidate
--stop error text ---------------------

I have been searching for the missing package, but it is not clear to me how to make sure this is included.

Thanks for any help you can give me.

[Michael]

It's found in Ubuntu package archive... sudo apt-get install php5-json. From Ubuntu Live you might need to manually enable the universe repository if it's in there.

[kllr]

Still not able to install

Ok, I went into the system settings and enabled the universe setting. I still get the same error message.

--start error text ---------------------
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package php5-json is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'php5-json' has no installation candidate
--stop error text ---------------------


Do I need to be in a particular directory when I run "sudo apt-get install php5-json"?

Do I need to download this "package" ?

I am new to running ubuntu from USB; is there something I need to do after enabling the universe setting?

Thanks again for your help.