Где находится Наутилус, загружающий иконки анимации?

счетчик в nautilus должен быть из gtk3, вы можете установить его в текущем файле gtk3 тем, для меня его /usr/share/themes/KILLMINT/gtk-3.0/gtk-widgets.css открыть и найти строку spinner вы найдете что-то подобное, связанное с счетчиком

/***********
* spinner *
***********/
.menu.spinner,
.primary-toolbar .spinner,
.primary-toolbar .spinner {
color: @theme_selected_bg_color;
}

.spinner:active {
 transition: 750ms linear loop;
}

и попробуйте посмотреть на другие темы или дистрибутивы, как выглядит их вращатель, и возьмите его код (+ проверьте, какой движок он использует, например, engine = none; или engine = unico; и есть ли некоторые функции этого движок, используемый в коде счетчика)

попробуйте код счетчика из zorin:

/***********
* spinner *
***********/
@keyframes spinner {
0.00% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)); }

12.5% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)); }

25.0% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)); }

37.5% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)); }

50.0% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)); }

62.5% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)); }

75.0% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)); }

87.5% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)); }

100%  { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.875)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.750)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.625)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.500)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.375)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.250)), to(transparent)),
                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.125)), to(transparent)); }
}

.spinner {
background-color: transparent;
background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                  -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                  -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                  -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                  -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                  -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                  -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
                  -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent));
background-position: 14% 14%, 0% 50%, 14% 86%, 50% 100%, 86% 86%, 100% 50%, 86% 14%, 50% 0%;
background-size: 20% 20%;
background-repeat: no-repeat;
}

.menu.spinner,
.primary-toolbar .spinner,
.primary-toolbar .spinner {
color: @selected_bg_color;
}

.spinner:active {
animation: spinner 1s infinite linear;
}

это сделает ваш счетчик похожим на круг, я бы выложил скриншот, но не имею некоторые моменты (я добавлю их), однако, gtk2 spinner будет работать так же, как я не нашел, как его настроить, выглядит где-то жестко, но ваш nautilus будет использовать те из gtk3, как это делает мой nemo, так что это не должно быть так плохо ..: D аплодисменты KiLLA