TDA4VM: Trouble during installing PSDKLA

Part Number: TDA4VM

Hi,

I am following the "Vision Apps User Guide" for installing the PSDKLA.

After adding below line in /etc/apt/apt.conf file:

Acquire::http::proxy "webproxy.ext.ti.com:80";

I am getting below errors when I run $sudo apt-get install corkscrew

Err:1 security.ubuntu.com/ubuntu bionic-security InRelease         
  Could not resolve 'webproxy.ext.ti.com'
Err:2 in.archive.ubuntu.com/ubuntu bionic InRelease                
  Could not resolve 'webproxy.ext.ti.com'
Err:3 in.archive.ubuntu.com/ubuntu bionic-updates InRelease
  Could not resolve 'webproxy.ext.ti.com'
Err:4 in.archive.ubuntu.com/ubuntu bionic-backports InRelease
  Could not resolve 'webproxy.ext.ti.com'
Reading package lists... Done
W: Failed to fetch in.archive.ubuntu.com/.../InRelease  Could not resolve 'webproxy.ext.ti.com'
W: Failed to fetch in.archive.ubuntu.com/.../InRelease  Could not resolve 'webproxy.ext.ti.com'
W: Failed to fetch in.archive.ubuntu.com/.../InRelease  Could not resolve 'webproxy.ext.ti.com'
W: Failed to fetch security.ubuntu.com/.../InRelease  Could not resolve 'webproxy.ext.ti.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

Thank you in advance.

Best Regards,

SR