vivid repo not found

[Sid Boyce]

I hit the same problem.
"sed -i 's/utopic/vivid/g' /etc/apt/sources.list"

After that, "aptitude update" and "aptitude full-upgrade".
root at sdrbox1:/usr/src# cat /etc/os-release
NAME="Ubuntu"
VERSION="15.04 (Vivid Vervet)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu Vivid Vervet (development branch)"
VERSION_ID="15.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"

Regards
Sid.

-- 
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
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Microsoft Windows Free Zone - Linux used for all Computing Tasks