As copy paste user I never realized the difference between that address :us.archive.ubuntu.com
Yes, old-release hold old version ubuntu that not supported any longer. I see that when I need to install php5-curl on Maverick and I get 404 message.
Change sources.list entry from us.archive.ubuntu.com to old-releases.ubuntu.com give me php5-curl
# apt-get install php5-curl
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following packages were automatically installed and are no longer required:
libfreeradius2 freeradius-common freeradius-utils libperl5.10
Use ‘apt-get autoremove’ to remove them.
0 upgraded, 1 newly installed, 0 to remove and 125 not upgraded.
Need to get 25.5kB of archives.
After this operation, 127kB of additional disk space will be used.
Install these packages without verification [y/N]? y
Check install :
# dpkg -l | grep curl
ii libcurl3 7.21.0-1ubuntu1 Multi-protocol file transfer library (OpenSSL)
ii libcurl3-gnutls 7.21.0-1ubuntu1 Multi-protocol file transfer library (GnuTLS)
ii php5-curl 5.2.10.dfsg.1-2ubuntu6 CURL module for php5
don’t forget to restart apache to get into business.