[squid-users] ubuntu apt-get update 404

Are there any known issues with squid 3.x and apt-get update on Ubuntu?
On 2.7 everything worked fine, but on 3.0-stable19 and 3.0-stable20, I
get random 404 responses when doing apt-get update. I tried starting
with a fresh cache, but no dice. Here's my squid.conf:

visible_hostname proxy
http_port 192.168.2.1:3128 transparent
snmp_port 3401
acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8
acl snmppublic snmp_community public
acl localnet src 192.168.1.0/24 # RFC1918 possible internal network
acl localnet src 192.168.2.0/24
acl SSL_ports port 443 # https
acl SSL_ports port 563 # snews
acl SSL_ports port 873 # rsync
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 631 # cups
acl Safe_ports port 873 # rsync
acl Safe_ports port 901 # SWAT
acl purge method PURGE
acl CONNECT method CONNECT
http_access allow manager localhost
http_access deny manager
http_access allow purge
http_access allow purge localhost
http_access deny purge
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localnet
http_access allow localhost
http_access deny all
icp_access allow localnet
icp_access deny all
http_port 192.168.2.1:3128
hierarchy_stoplist cgi-bin ?
 cache_dir diskd /usr/local/squid/var/cache2 15000 16 256
maximum_object_size 819200 KB
access_log /usr/local/squid/var/logs/access.log squid
pid_filename /var/run/squid.pid
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern (Release|Package(.gz)*)$ 0 20% 2880
refresh_pattern . 0 20% 4320
cache_effective_user proxy
cache_effective_group proxy
 client_persistent_connections off
 server_persistent_connections off
snmp_port 3401
 snmp_access allow snmppublic localnet
 snmp_access allow localnet
 snmp_access allow localhost
 snmp_incoming_address 0.0.0.0
 snmp_outgoing_address 255.255.255.255
hosts_file /etc/hosts
forwarded_for off
coredump_dir /usr/local/squid/var/cache
Received on Fri Nov 06 2009 - 22:04:24 MST