how to install sassc ?

Odoo 12 error while creating DB

Odoo 12 Error Could not execute command 'sassc'
How to solve Below ErrorCould not execute command 'sassc'This error occured while compiling the bundle 'web.assets_common' containing:
    - /web/static/lib/bootstrap/scss/_functions.scss
    - /web/static/lib/bootstrap/scss/_mixins.scss
    - /web/static/src/scss/utils.scss
    - /web/static/src/scss/bs_mixins_overrides.scss
    - /web/static/src/scss/primary_variables.scss
    - /web_editor/static/src/scss/web_editor.variables.scss
    - /web/static/src/scss/secondary_variables.scss
    - /web/static/lib/bootstrap/scss/_variables.scss
    - /web/static/src/scss/fonts.scss
    - /web/static/src/scss/ui.scss
    - /web/static/src/scss/ui_extra.scss
    - /web/static/src/scss/navbar.scss
    - /web/static/src/scss/mimetypes.scss
    - /web/static/src/scss/modal.scss
    - /web/static/src/scss/animation.scss
    - /web/static/src/scss/rainbow.scss
    - /web/static/src/scss/datepicker.scss
    - /web/static/src/scss/banner.scss
    - /web/static/src/scss/colorpicker.scss
    - /web/static/src/scss/keyboard.scss
    - /web_tour/static/src/scss/tip.scss
    - /web_tour/static/src/scss/keyframes.scss 
2018-10-19 08:51:58,230 10737 WARNING odoo12 odoo.addons.base.models.assetsbundle: Could not execute command 'sassc'This error occured while compiling the bundle 'web.assets_backend' containing:
    - /web/static/lib/bootstrap/scss/_functions.scss
    - /web/static/lib/bootstrap/scss/_mixins.scss
    - /web/static/src/scss/utils.scss
    - /web/static/src/scss/bs_mixins_overrides.scss
    - /web/static/src/scss/primary_variables.scss
    - /web_editor/static/src/scss/web_editor.variables.scss
    - /web/static/src/scss/secondary_variables.scss
    - /web/static/src/scss/bootstrap_overridden.scss
    - /web_editor/static/src/scss/bootstrap_overridden.scss
    - /web/static/src/scss/import_bootstrap_part1.scss
    - /web/static/src/scss/bs_mixins_overrides.scss
    - /web/static/src/scss/import_bootstrap_part2.scss
    - /web/static/lib/tempusdominus/tempusdominus.scss
    - /web/static/src/scss/webclient_extra.scss
    - /web/static/src/scss/webclient_layout.scss
    - /web/static/src/scss/webclient.scss
    - /web/static/src/scss/domain_selector.scss
    - /web/static/src/scss/model_field_selector.scss
    - /web/static/src/scss/progress_bar.scss
    - /web/static/src/scss/dropdown.scss
    - /web/static/src/scss/dropdown_extra.scss
    - /web/static/src/scss/tooltip.scss
    - /web/static/src/scss/debug_manager.scss
    - /web/static/src/scss/control_panel.scss
    - /web/static/src/scss/fields.scss
    - /web/static/src/scss/fields_extra.scss
    - /web/static/src/scss/views.scss
    - /web/static/src/scss/pivot_view.scss
    - /web/static/src/scss/graph_view.scss
    - /web/static/src/scss/form_view.scss
    - /web/static/src/scss/form_view_extra.scss
    - /web/static/src/scss/list_view.scss
    - /web/static/src/scss/list_view_extra.scss
    - /web/static/src/scss/kanban_dashboard.scss
    - /web/static/src/scss/kanban_examples_dialog.scss
    - /web/static/src/scss/kanban_column_progressbar.scss
    - /web/static/src/scss/kanban_view.scss
    - /web/static/src/scss/kanban_view_mobile.scss
    - /web/static/src/scss/web_calendar.scss
    - /web/static/src/scss/search_view.scss
    - /web/static/src/scss/search_view_mobile.scss
    - /web/static/src/scss/dropdown_menu.scss
    - /web/static/src/scss/search_view_extra.scss
    - /web/static/src/scss/data_export.scss
    - /base/static/src/scss/onboarding.scss
    - /web/static/src/scss/base_settings.scss
    - /web/static/src/scss/report_backend.scss
    - /base_import/static/src/scss/base_import.scss
    - /web_diagram/static/src/scss/diagram_view.scss
    - /web_editor/static/src/scss/web_editor.common.scss
    - /web_editor/static/src/scss/web_editor.backend.scss
    - /web_settings_dashboard/static/src/scss/dashboard.scss 
2018-10-19 08:51:58,309 10737 WARNING odoo12 odoo.addons.base.models.assetsbundle: Could not execute command 'sassc'This error occured while compiling the bundle 'web_editor.assets_editor' containing:
    - /web/static/lib/bootstrap/scss/_functions.scss
    - /web/static/lib/bootstrap/scss/_mixins.scss
    - /web/static/src/scss/utils.scss
    - /web/static/src/scss/bs_mixins_overrides.scss
    - /web/static/src/scss/primary_variables.scss
    - /web_editor/static/src/scss/web_editor.variables.scss
    - /web/static/src/scss/secondary_variables.scss
    - /web/static/lib/bootstrap/scss/_variables.scss
    - /web_editor/static/src/scss/web_editor.ui.scss 

Solutions: 
sudo pip3 install libsass==0.12.3 and also check requirement.txt install proper or not.

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