The use of SHA1 is deprecated and gives strong warnings in Debian apt based distributions (e.g. Ubuntu).
https://download.alephobjects.com/ao/aodeb/dists/wheezy/Release.gpg: Signature by key 88E7C763A506DE12AAB1DEF94C0B27E86C64E93E uses weak digest algorithm (SHA1)
An upgrade to SHA255 should be considered IMHO.