add-apt-repository使うとエラーで使えない場合

root@test1:~# add-apt-repository ppa:ondrej/php5
Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 125, in <module>
    ppa_info = get_ppa_info_from_lp(user, ppa_name)
  File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 80, in get_ppa_info_from_lp
    curl.perform()
pycurl.error: (77, 'Problem with the SSL CA cert (path? access rights?)')

ただパッケージ不足だった

apt-get install ca-certificates