/usr/include/KF5/Libkleo/ is in libkf5libkleo-dev 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/Libkleo/ChecksumDefinition
/usr/include/KF5/Libkleo/Classify
/usr/include/KF5/Libkleo/CryptoConfigDialog
/usr/include/KF5/Libkleo/CryptoConfigModule
/usr/include/KF5/Libkleo/DNAttributeOrderConfigWidget
/usr/include/KF5/Libkleo/DefaultKeyFilter
/usr/include/KF5/Libkleo/DefaultKeyGenerationJob
/usr/include/KF5/Libkleo/DirectoryServicesWidget
/usr/include/KF5/Libkleo/Dn
/usr/include/KF5/Libkleo/Enum
/usr/include/KF5/Libkleo/Exception
/usr/include/KF5/Libkleo/FileNameRequester
/usr/include/KF5/Libkleo/FileSystemWatcher
/usr/include/KF5/Libkleo/Formatting
/usr/include/KF5/Libkleo/KConfigBasedKeyFilter
/usr/include/KF5/Libkleo/KDHorizontalLine
/usr/include/KF5/Libkleo/KeyApprovalDialog
/usr/include/KF5/Libkleo/KeyCache
/usr/include/KF5/Libkleo/KeyFilter
/usr/include/KF5/Libkleo/KeyFilterManager
/usr/include/KF5/Libkleo/KeyListModel
/usr/include/KF5/Libkleo/KeyListModelInterface
/usr/include/KF5/Libkleo/KeyListSortFilterProxyModel
/usr/include/KF5/Libkleo/KeyRearrangeColumnsProxyModel
/usr/include/KF5/Libkleo/KeyRequester
/usr/include/KF5/Libkleo/KeySelectionCombo
/usr/include/KF5/Libkleo/KeySelectionDialog
/usr/include/KF5/Libkleo/MessageBox
/usr/include/KF5/Libkleo/OidMap
/usr/include/KF5/Libkleo/Predicates
/usr/include/KF5/Libkleo/ProgressDialog
/usr/include/KF5/Libkleo/Stl_Util
/usr/include/KF5/Libkleo/SubkeyListModel
/usr/include/KF5/Libkleo/UserIDListModel