Williams' reserve driver made his return to a F1 Grand Prix for the first time since a 2011 rallying accident prematurely ended his F1 career.
Kubica repalced Sergey Sirotkin for FP1, but found it "difficult to enjoy".
The Pole said:
"In the end, it's difficult to say it was enjoyable because our car balance was very bad and it was very difficult to drive so it was difficult to enjoy.
"But I'm satisfied with the session, and how I react to difficult conditions and difficult balance. It sounds strange that you can be happy about P19, but actually I'm happy."
Kubica added:
"Same as three months ago! I'm not the right person to go too much into the details. We know exactly what is our weakest part of the car.
"What is good, we started a project which should help us to understand better, improve it and hopefully solve it completely. It's not a question of one day or one month, probably it's even more. So we have to be patient. Miracles will not happen, we will have better tracks, for example Baku.
"Coming to Barcelona, I was expecting to be in a difficult situation. FP1 was even more difficult than expected."
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