trouble installing (gcc)

root@C2DL:~# apt-get install gcc --install-recommends
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  gcc-4.9 libasan1 libatomic1 libc-dev-bin libc6-dev libcilkrts5
  libgcc-4.9-dev libitm1 liblsan0 libtsan0 libubsan0 linux-libc-dev
  manpages-dev
Suggested packages:
  gcc-multilib autoconf automake libtool flex bison gdb gcc-doc
  gcc-4.9-multilib gcc-4.9-doc gcc-4.9-locales libgcc1-dbg libgomp1-dbg
  libitm1-dbg libatomic1-dbg libasan1-dbg liblsan0-dbg libtsan0-dbg
  libubsan0-dbg libcilkrts5-dbg libquadmath0-dbg glibc-doc
The following NEW packages will be installed:
  gcc gcc-4.9 libasan1 libatomic1 libc-dev-bin libc6-dev libcilkrts5
  libgcc-4.9-dev libitm1 liblsan0 libtsan0 libubsan0 linux-libc-dev
  manpages-dev
0 upgraded, 14 newly installed, 0 to remove and 29 not upgraded.
Need to get 13.2 MB of archives.
After this operation, 48.6 MB of additional disk space will be used.
Do you want to continue? [Y/n]
Err http://security.debian.org/ jessie/updates/main linux-libc-dev amd64 3.16.7-ckt20-1+deb8u1
  404  Not Found [IP: 149.20.20.19 80]
Get:1 http://ftp.us.debian.org/debian/ jessie/main libasan1 amd64 4.9.2-10 [195 kB]
Get:2 http://ftp.us.debian.org/debian/ jessie/main libatomic1 amd64 4.9.2-10 [8,992 B]
Get:3 http://ftp.us.debian.org/debian/ jessie/main libcilkrts5 amd64 4.9.2-10 [40.1 kB]
Get:4 http://ftp.us.debian.org/debian/ jessie/main libitm1 amd64 4.9.2-10 [29.2 kB]
Get:5 http://ftp.us.debian.org/debian/ jessie/main liblsan0 amd64 4.9.2-10 [92.8 kB]
Get:6 http://ftp.us.debian.org/debian/ jessie/main libtsan0 amd64 4.9.2-10 [212 kB]
Get:7 http://ftp.us.debian.org/debian/ jessie/main libubsan0 amd64 4.9.2-10 [82.4 kB]
Get:8 http://ftp.us.debian.org/debian/ jessie/main libgcc-4.9-dev amd64 4.9.2-10 [2,066 kB]
Get:9 http://ftp.us.debian.org/debian/ jessie/main gcc-4.9 amd64 4.9.2-10 [5,352 kB]
Get:10 http://ftp.us.debian.org/debian/ jessie/main gcc amd64 4:4.9.2-2 [5,136 B]
Get:11 http://ftp.us.debian.org/debian/ jessie/main libc-dev-bin amd64 2.19-18+deb8u1 [237 kB]
Get:12 http://ftp.us.debian.org/debian/ jessie/main libc6-dev amd64 2.19-18+deb8u1 [1,998 kB]
Get:13 http://ftp.us.debian.org/debian/ jessie/main manpages-dev all 3.74-1 [1,865 kB]
Fetched 12.2 MB in 1min 42s (118 kB/s)
E: Failed to fetch http://security.debian.org/pool/updates/main/l/linux/linux-libc-dev_3.16.7-ckt20-1+deb8u1_amd64.deb  404  Not Found [IP: 149.20.20.19 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
root@C2DL:~# apt-get install gcc --install-recommends --fix-missing
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  gcc-4.9 libasan1 libatomic1 libc-dev-bin libc6-dev libcilkrts5
  libgcc-4.9-dev libitm1 liblsan0 libtsan0 libubsan0 linux-libc-dev
  manpages-dev
Suggested packages:
  gcc-multilib autoconf automake libtool flex bison gdb gcc-doc
  gcc-4.9-multilib gcc-4.9-doc gcc-4.9-locales libgcc1-dbg libgomp1-dbg
  libitm1-dbg libatomic1-dbg libasan1-dbg liblsan0-dbg libtsan0-dbg
  libubsan0-dbg libcilkrts5-dbg libquadmath0-dbg glibc-doc
The following NEW packages will be installed:
  gcc gcc-4.9 libasan1 libatomic1 libc-dev-bin libc6-dev libcilkrts5
  libgcc-4.9-dev libitm1 liblsan0 libtsan0 libubsan0 linux-libc-dev
  manpages-dev
0 upgraded, 14 newly installed, 0 to remove and 29 not upgraded.
Need to get 1,008 kB/13.2 MB of archives.
After this operation, 48.6 MB of additional disk space will be used.
Do you want to continue? [Y/n]
Err http://security.debian.org/ jessie/updates/main linux-libc-dev amd64 3.16.7-ckt20-1+deb8u1
  404  Not Found [IP: 128.61.240.73 80]
Unable to correct missing packages.
E: Failed to fetch http://security.debian.org/pool/updates/main/l/linux/linux-libc-dev_3.16.7-ckt20-1+deb8u1_amd64.deb  404  Not Found [IP: 128.61.240.73 80]

E: Aborting install.