$ grep -l "#ubuntu" ~/blog/*

total 6

1. 2013-04-25 Building Qt 4.8.4 on Ubuntu 12.04 #cpp #qt #ubuntu
2. 2012-10-13 Error When Launching Eclipse on Ubuntu #java #ubuntu
3. 2012-09-16 Installing Oracle (Sun) Java on Ubuntu 12.04 #java #ubuntu
4. 2012-07-05 Slow Network Speed on Ubuntu Running in VMware #ubuntu #vm
5. 2012-07-04 Setting Up Android Device Debugging on Ubuntu #android #ubuntu