This TN will help you:
Using catalog backup and recovery to transfer NetBackup catalogs between UNIX or Linux master servers as part of a hardware refresh
So, install new Linux server with same hostname, install NBU to same path as on Solaris server (Solaris default is /opt. Please verify).
Patch NBU to 220.127.116.11, then recover catalog.
I have found it easiest to do catalog backup on source master to NFS share (create a DSU) and also copy DR-file to same folder.
Just mount the NFS to same path on the Linux server and recover catalog.