irssi apt-get not installing

I'm trying to install irssi via apt-get. When i enter sudo apt-get install irssi i get the following error:

Err http://ift.tt/1gRm4rd kali/main libperl5.14 armel 5.14.2-21+deb7u1
  404  Not Found
Get:1 http://ift.tt/1gRm4rd kali/main irssi armel 0.8.15-5 [1,053 kB]
Fetched 1,053 kB in 7s (141 kB/s)                                              
Failed to fetch http://ift.tt/1KipaRQ  404  Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

when i type irssi in the terminal screen i get -bash: irssi: command not found. How do i correctly install irssi? thanks. when i try sudo apt-get update i get the following error:

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ift.tt/1nrLYFu kali/updates Release: The following signatures were invalid: KEYEXPIRED 1425567400 KEYEXPIRED 1425567400 KEYEXPIRED 1425567400

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://http.kali.org kali Release: The following signatures were invalid: KEYEXPIRED 1425567400 KEYEXPIRED 1425567400 KEYEXPIRED 1425567400

W: Failed to fetch http://ift.tt/1rwn4Xr  

W: Failed to fetch http://ift.tt/1rwn6OV  

W: Some index files failed to download. They have been ignored, or old ones used instead.

I'm using kali linux as my os