每当我尝试通过命令行添加存储库时，都会收到以下错误消息：
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: (60, 'server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none')
有没有办法补救这种情况？