/usr/share/elmerfront/lib/SolverLinearFields.edf is in elmer-common 6.1.0.svn.5396.dfsg2-4ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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! ElmerFront Solver panel linear system related fields
! 11.06.2003
!-------------------------------------------------------------------
! NOTE: This file cannot be loaded as a separate file.
! It can be only included within a Panel section!
! NOTE: These fields are all predefined fields in ElmerFront, so they 'inherit'
! all the default properties and it is enough just to list the proper internal
! field names here in order to include them for user defined equation solvers.
Field = "Linear System Label"
Field = "Linear System Solver"
Field = "Linear System Method"
Field = "Linear System Abort Not Converged"
Field = "Linear System Max Iterations"
Field = "Linear System Convergence Tolerance"
Field = "Linear System Preconditioning"
Field = "Linear System ILUT Tolerance"
Field = "Linear System Residual Output"
Field = "Steady State Convergence Tolerance"
! New field
Field = "Linear System Precondition Recompute"
Label = "Lin.Sys.Precond. Recompute"
Type = Integer
Initial Value = 1
Panel Frame = 2
! NOTE: These fields are internal 'helper' fields.
! They are needed for ElmerFront, but they will not be output to Sif file!
!
Field = "LINEAR SYSTEM ITERATIVE METHOD"
Display = 0
Field = "LINEAR SYSTEM DIRECT METHOD"
Display = 0
Field = "LINEAR SYSTEM MULTIGRID METHOD"
Display = 0
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