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/usr/share/cp2k/DFTB/uff_table is in cp2k-data 2.6.2-3.

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The actual contents of the file can be viewed below.

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#            UFF Force field parameters, as published in
#
#  [UFF1] A.K. Rappe, C.J. Casewit, K.S. Colwell, W.A. Goddard III, and
#    W. M. Skiff, "UFF, a Full Periodic Table Force Field for Molecular
#    Dynamics Simulations", J Am Chem Soc 114, 10024-10035 (1992).
#
#  [UFF2] A.K. Rappe, W.A. Goddard III, "Charge Equilibration for Molecular
#    Dynamics Simulations", J Phys Chem 95, 3358-3363 (1991).
#
#  [UFF3] M. O'Keeffe and N.E. Brese, "Atom sizes and bond lengths in
#    Molecules and Crystals", J Am Chem Soc 113, 3226-3229 (1991).
#
#  [UFF4] S.L. Mayo, B.D. Olafson, W.A. Goddard III, "DREIDING: A Generic
#    Force Field for Molecular Simulations", J Phys Chem 94, 8897-8909 (1990).
#
#  [UFF5] C.J. Casewit, K.S. Colwell, A.K. Rappe, "Applications of a Universal
#    Force Field to Main Group Compounds", J Am Chem Soc 114, 10046-10053
#    (1992).
#
#  Comments for this table and for the deMon implementation:
#
#  Author: Serguei Patchkovskii, 2003
#
#  Additional atom types, not present in UFF.
#
#  If you feel like adding a new forcefield type, please keep in mind that the hybridization
#  code is very important in the definition of torsional potentials, and should be assigned
#  properly. The number of bonds (nc) is also used in the definition of torsional parameters,
#  and should be assigned correctly.
#
#  It is NOT NECESSARY to add a new forcefield type if you simply want to correct a
#  wrong bond length - specifying a higher bond order in the connection matrix will
#  shorten the bond, while lower bond order will make it longer. The rate of change
#  in the bond length is about -13% per unit increase in bond order.
#
#  N_3+4 is identical to N_3, except that it is 4-coordinated (rather than 3-coordinated).
#  Unfortunately, there is no way of having a clean QM/MM implementation, while still allowing
#  varying coordination numbers, as original UFF does.
#
#
#  The UFF force field code uses "chemical" system
#  of units. Distances are measured in Angstrom, angles in degrees,
#  energies in kcal/mol, and charges in electron charges.
#            
#        valence       nonbond
#        --------    --------------
#        ri   phi    xi    di    psi    zmm   vsp3   vsp2   chi    nc
#       Ang   Deg    Ang   K/M   Deg     e   K/M    K/M
#
"H_   ",0.354,180.0 ,2.886,0.044,12.0  ,0.712,0.0  , 0.0 , 4.5280, 0
"H_b  ",0.460,83.5  ,2.886,0.044,12.0  ,0.712,0.0  , 0.0 , 4.5280, 2
"He4+4",0.849,90.0  ,2.362,0.056,15.24 ,0.098,0.0  , 0.0 , 5.181 , 0
"Li   ",1.336,180.0 ,2.451,0.025,12.0  ,1.026,0.0  , 2.0 , 3.006 , 0
"Be3+2",1.074,109.47,2.745,0.085,12.0  ,1.565,0.0  , 2.0 , 3.742 , 0
"B_3  ",0.838,109.47,4.083,0.180,12.052,1.755,0.0  , 2.0 , 4.076 , 3
"B_2  ",0.828,120.0 ,4.083,0.180,12.052,1.755,0.0  , 2.0 , 4.076 , 3
"C_3  ",0.757,109.47,3.851,0.105,12.73 ,1.912,2.119, 2.0 , 5.343 , 4
"C_R  ",0.729,120.0 ,3.851,0.105,12.73 ,1.912,0.0  , 2.0 , 5.343 , 3
"C_2  ",0.732,120.0 ,3.851,0.105,12.73 ,1.912,0.0  , 2.0 , 5.343 , 3
"C_1  ",0.706,180.0 ,3.851,0.105,12.73 ,1.912,0.0  , 2.0 , 5.343 , 0
"N_3  ",0.700,106.7 ,3.660,0.069,13.407,2.544,0.450, 2.0 , 6.899 , 3
"N_R  ",0.699,120.0 ,3.660,0.069,13.407,2.544,0.0  , 2.0 , 6.899 , 3
"N_2  ",0.685,111.2 ,3.660,0.069,13.407,2.544,0.0  , 2.0 , 6.899 , 2
"N_1  ",0.656,180.0 ,3.660,0.069,13.407,2.544,0.0  , 2.0 , 6.899 , 0
"O_3  ",0.658,104.51,3.500,0.060,14.085,2.300,0.018, 2.0 , 8.741 , 2
"O_3_z",0.528,145.45,3.500,0.060,14.085,2.300,0.018, 2.0 , 8.741 , 2
"O_R  ",0.680,110.0 ,3.500,0.060,14.085,2.300,0.0  , 2.0 , 8.741 , 2
"O_2  ",0.634,120.0 ,3.500,0.060,14.085,2.300,0.0  , 2.0 , 8.741 , 1
"O_1  ",0.639,180.0 ,3.500,0.060,14.085,2.300,0.0  , 2.0 , 8.741 , 1
"F_   ",0.668,180.0 ,3.364,0.050,14.762,1.735,0.0  , 2.0 ,10.874 , 0
"Ne4+4",0.920,90.0  ,3.243,0.042,15.440,0.194,0.0  , 2.0 ,10.963 , 0
"Na   ",1.539,180.0 ,2.983,0.030,12.0  ,1.081,0.0  , 1.25, 2.843 , 0
"Mg3+2",1.421,109.47,3.021,0.111,12.0  ,1.787,0.0  , 1.25, 3.241 , 0
"Al3  ",1.244,109.47,4.499,0.505,11.278,1.792,0.0  , 1.25, 3.044 , 0
"Si3  ",1.117,109.47,4.295,0.402,12.175,2.323,1.225, 1.25, 4.168 , 4
"P_3+3",1.101,93.8  ,4.147,0.305,13.072,2.863,2.400, 1.25, 5.463 , 3
"P_3+5",1.056,109.47,4.147,0.305,13.072,2.863,2.400, 1.25, 5.463 , 4
"P_3+q",1.056,109.47,4.147,0.305,13.072,2.863,2.400, 1.25, 5.463 , 4
"S_3+2",1.064,92.1  ,4.035,0.274,13.969,2.703,0.484, 1.25, 6.928 , 2
"S_3+4",1.049,103.20,4.035,0.274,13.969,2.703,0.484, 1.25, 6.928 , 4
"S_3+6",1.027,109.47,4.035,0.274,13.969,2.703,0.484, 1.25, 6.928 , 4
"S_R  ",1.077,92.2  ,4.035,0.274,13.969,2.703,0.0  , 1.25, 6.928 , 2
"S_2  ",0.854,120.0 ,4.035,0.274,13.969,2.703,0.0  , 1.25, 6.928 , 2
"Cl   ",1.044,180.0 ,3.947,0.227,14.866,2.348,0.0  , 1.25, 8.564 , 0
"Ar4+4",1.032,90.0  ,3.868,0.185,15.763,0.300,0.0  , 1.25, 7.984 , 0
"K_   ",1.953,180.0 ,3.812,0.035,12.0  ,1.165,0.0  , 0.7 , 2.421 , 0
"Ca6+2",1.761,90.0  ,3.399,0.238,12.0  ,2.141,0.0  , 0.7 , 2.714 , 0
"Sc3+3",1.513,109.47,3.295,0.019,12.0  ,2.595,0.0  , 0.0 , 3.333 , 0
"Ti3+4",1.412,109.47,3.175,0.017,12.0  ,2.659,0.0  , 0.0 , 3.682 , 0
"Ti6+4",1.412,90.0  ,3.175,0.017,12.0  ,2.659,0.0  , 0.0 , 3.682 , 0
"V_3+5",1.402,109.47,3.144,0.016,12.0  ,2.679,0.0  , 0.0 , 3.866 , 0
"Cr6+3",1.345,90.0  ,3.023,0.015,12.0  ,2.463,0.0  , 0.0 , 3.928 , 0
"Mn6+2",1.382,90.0  ,2.961,0.013,12.0  ,2.430,0.0  , 0.0 , 3.702 , 0
"Fe3+2",1.270,109.47,2.912,0.013,12.0  ,2.430,0.0  , 0.0 , 4.298 , 0
"Fe6+2",1.335,90.0  ,2.912,0.013,12.0  ,2.430,0.0  , 0.0 , 4.298 , 0
"Co6+3",1.241,90.0  ,2.872,0.014,12.0  ,2.430,0.0  , 0.0 , 4.411 , 0
"Ni4+2",1.164,90.0  ,2.834,0.015,12.0  ,2.430,0.0  , 0.0 , 4.479 , 0
"Cu3+1",1.302,109.47,3.495,0.005,12.0  ,1.756,0.0  , 0.0 , 4.456 , 0
"Zn3+2",1.193,109.47,2.763,0.124,12.0  ,1.308,0.0  , 0.0 , 3.907 , 0
"Ga3+3",1.260,109.47,4.383,0.415,11.0  ,1.821,0.0  , 0.7 , 4.253 , 0
"Ge3  ",1.197,109.47,4.280,0.379,12.0  ,2.789,0.701, 0.7 , 4.050 , 4
"As3+3",1.211,92.1  ,4.230,0.309,13.0  ,2.864,1.5  , 0.7 , 5.192 , 3
"Se3+2",1.190,90.6  ,4.205,0.291,14.0  ,2.764,0.335, 0.7 , 6.408 , 2
"Br   ",1.192,180.0 ,4.189,0.251,15.0  ,2.519,0.0  , 0.7 , 7.790 , 0
"Kr4+4",1.147,90.0 , 4.141,0.220,16.0  ,0.452,0.0  , 0.7 , 7.466 , 0
"Rb   ",2.260,180.0 ,4.114,0.040,12.0  ,1.592,0.0  , 0.2 , 2.331 , 0
"Sr6+2",2.052,90.0  ,3.641,0.235,12.0  ,2.449,0.0  , 0.2 , 2.636 , 0
"Y_3+3",1.698,109.47,3.345,0.072,12.0  ,3.257,0.0  , 0.0 , 3.080 , 0
"Zr3+4",1.564,109.47,3.124,0.069,12.0  ,3.667,0.0  , 0.0 , 3.278 , 0
"Nb3+5",1.473,109.47,3.165,0.059,12.0  ,3.618,0.0  , 0.0 , 3.804 , 0
"Mo6+6",1.467,90.0  ,3.052,0.056,12.0  ,3.400,0.0  , 0.0 , 5.080 , 0
"Mo3+6",1.484,109.47,3.052,0.056,12.0  ,3.400,0.0  , 0.0 , 5.080 , 0
"Tc6+5",1.322,90.0  ,2.998,0.048,12.0  ,3.400,0.0  , 0.0 , 4.456 , 0
"Ru6+2",1.478,90.0  ,2.963,0.056,12.0  ,3.400,0.0  , 0.0 , 5.181 , 0
"Rh6+3",1.332,90.0  ,2.929,0.053,12.0  ,3.508,0.0  , 0.0 , 5.387 , 0
"Pd4+2",1.338,90.0  ,2.899,0.048,12.0  ,3.210,0.0  , 0.0 , 5.181 , 0
"Ag1+1",1.386,180.0 ,3.148,0.036,12.0  ,1.956,0.0  , 0.0 , 4.526 , 0
"Cd3+2",1.403,109.0 ,2.848,0.228,12.0  ,1.650,0.0  , 0.0 , 3.992 , 0
"In3+3",1.459,109.47,4.463,0.599,11.0  ,2.070,0.0  , 0.2 , 4.187 , 0
"Sn3  ",1.398,109.47,4.392,0.567,12.0  ,2.961,0.199, 0.2 , 4.596 , 4
"Sb3+3",1.407,91.6  ,4.420,0.449,13.0  ,2.704,1.1  , 0.2 , 4.810 , 3
"Te3+2",1.386,90.25 ,4.470,0.398,14.0  ,2.882,0.3  , 0.2 , 4.932 , 2
"I_   ",1.382,180.0 ,4.500,0.339,15.0  ,2.650,0.0  , 0.2 , 6.822 , 0
"Xe4+4",1.267,90.0  ,4.404,0.332,12.0  ,0.556,0.0  , 0.2 , 6.260 , 0
"Cs   ",2.570,180.0 ,4.517,0.045,12.0  ,1.573,0.0  , 0.1 , 2.183 , 0
"Ba6+2",2.277,90.0  ,3.703,0.364,12.0  ,2.727,0.0  , 0.1 , 2.545 , 0
"La3+3",1.943,109.47,3.522,0.017,12.0  ,3.300,0.0  , 0.0 , 2.876 , 0
"Ce6+3",1.841,90.0  ,3.556,0.013,12.0  ,3.300,0.0  , 0.0 , 2.909 , 0
"Pr6+3",1.823,90.0  ,3.606,0.010,12.0  ,3.300,0.0  , 0.0 , 2.926 , 0
"Nd6+3",1.816,90.0  ,3.575,0.010,12.0  ,3.300,0.0  , 0.0 , 2.942 , 0
"Pm6+3",1.801,90.0  ,3.547,0.009,12.0  ,3.300,0.0  , 0.0 , 2.976 , 0
"Sm6+3",1.780,90.0  ,3.520,0.008,12.0  ,3.300,0.0  , 0.0 , 2.993 , 0
"Eu6+3",1.771,90.0  ,3.493,0.008,12.0  ,3.300,0.0  , 0.0 , 3.028 , 0
"Gd6+3",1.735,90.0  ,3.368,0.009,12.0  ,3.300,0.0  , 0.0 , 3.045 , 0
"Tb6+3",1.732,90.0  ,3.451,0.007,12.0  ,3.300,0.0  , 0.0 , 3.063 , 0
"Dy6+3",1.710,90.0  ,3.428,0.007,12.0  ,3.300,0.0  , 0.0 , 3.080 , 0
"Ho6+3",1.696,90.0  ,3.409,0.007,12.0  ,3.416,0.0  , 0.0 , 3.098 , 0
"Er6+3",1.673,90.0  ,3.391,0.007,12.0  ,3.300,0.0  , 0.0 , 3.115 , 0
"Tm6+3",1.660,90.0  ,3.374,0.006,12.0  ,3.300,0.0  , 0.0 , 3.133 , 0
"Yb6+3",1.637,90.0  ,3.355,0.228,12.0  ,2.618,0.0  , 0.0 , 3.151 , 0
"Lu6+3",1.671,90.0  ,3.640,0.041,12.0  ,3.271,0.0  , 0.0 , 3.169 , 0
"Hf3+4",1.611,109.47,3.141,0.072,12.0  ,3.921,0.0  , 0.0 , 3.223 , 0
"Ta3+5",1.511,109.47,3.170,0.081,12.0  ,4.075,0.0  , 0.0 , 3.602 , 0
"W_6+6",1.392,90.0  ,3.069,0.067,12.0  ,3.700,0.0  , 0.0 , 5.597 , 0
"W_3+4",1.526,109.47,3.069,0.067,12.0  ,3.700,0.0  , 0.0 , 5.597 , 0
"W_3+6",1.380,109.47,3.069,0.067,12.0  ,3.700,0.0  , 0.0 , 5.597 , 0
"Re6+5",1.372,90.0  ,2.954,0.066,12.0  ,3.700,0.0  , 0.0 , 4.456 , 0
"Re3+7",1.314,109.47,2.954,0.066,12.0  ,3.700,0.0  , 0.0 , 4.456 , 0
"Os6+6",1.372,90.0  ,3.120,0.037,12.0  ,3.700,0.0  , 0.0 , 5.181 , 0
"Ir6+3",1.371,90.0  ,2.840,0.073,12.0  ,3.731,0.0  , 0.0 , 5.181 , 0
"Pt4+2",1.364,90.0  ,2.754,0.080,12.0  ,3.382,0.0  , 0.0 , 5.387 , 0
"Au4+3",1.262,90.0  ,3.293,0.039,12.0  ,2.625,0.0  , 0.0 , 6.090 , 0
"Hg1+2",1.340,180.0 ,2.705,0.385,12.0  ,1.750,0.0  , 0.0 , 4.690 , 0
"Tl3+3",1.518,120.0 ,4.347,0.680,11.0  ,2.068,0.0  , 0.1 , 3.845 , 0
"Pb3  ",1.459,109.0 ,4.297,0.663,12.0  ,2.846,0.1  , 0.1 , 5.518 , 4
"Bi3+3",1.512,90.0  ,4.370,0.518,13.0  ,2.470,1.0  , 0.1 , 4.738 , 3
"Po3+2",1.500,90.0  ,4.709,0.325,14.0  ,2.330,0.3  , 0.1 , 4.690 , 2
"At   ",1.545,180.0 ,4.750,0.284,15.0  ,2.240,0.0  , 0.1 , 5.181 , 0
"Rn4+4",1.420,90.0  ,4.765,0.284,16.0  ,0.583,0.0  , 0.1 , 5.181 , 0
"Fr   ",2.880,180.0 ,4.900,0.050,12.0  ,1.847,0.0  , 0.0 , 2.277 , 0
"Ra6+2",2.512,90.0  ,3.677,0.404,12.0  ,2.920,0.0  , 0.0 , 2.560 , 0
"Ac6+3",1.983,90.0  ,3.478,0.033,12.0  ,3.900,0.0  , 0.0 , 2.876 , 0
"Th6+4",1.721,90.0  ,3.396,0.026,12.0  ,4.202,0.0  , 0.0 , 3.223 , 0
"Pa6+4",1.711,90.0  ,3.424,0.022,12.0  ,3.900,0.0  , 0.0 , 3.602 , 0
"U_6+4",1.684,90.0  ,3.395,0.022,12.0  ,3.900,0.0  , 0.0 , 3.371 , 0
"Np6+4",1.666,90.0  ,3.424,0.019,12.0  ,3.900,0.0  , 0.0 , 3.333 , 0
"Pu6+4",1.657,90.0  ,3.424,0.016,12.0  ,3.900,0.0  , 0.0 , 3.187 , 0
"Am6+4",1.660,90.0  ,3.381,0.014,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"Cm6+3",1.801,90.0  ,3.326,0.013,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"Bk6+3",1.761,90.0  ,3.339,0.013,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"Cf6+3",1.750,90.0  ,3.313,0.013,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"Es6+3",1.724,90.0  ,3.299,0.012,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"Fm6+3",1.712,90.0  ,3.286,0.012,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"Md6+3",1.689,90.0  ,3.274,0.011,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"No6+3",1.679,90.0  ,3.248,0.011,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"Lw6+3",1.698,90.0  ,3.236,0.011,12.0  ,3.900,0.0  , 0.0 , 3.223 , 0
"N_3+4",0.700,106.7 ,3.660,0.069,13.407,2.544,0.450, 2.0 , 6.899 , 4