This is a maintenance release. The following items were fixed and/or added:

- User interface: various improvements for high resolution screens
- User interface: added functionality to duplicate optical and floppy images
- User interface: various improvements for the virtual media manager
- VMM: fixed emulation so that Plan 9 guests can start once more (5.1.0 regression)
- Storage: fixed regression breaking iSCSI (bug #17196)
- Audio: added HDA support for more exotic guests (e.g. Haiku)
- Serial: fixed hanging I/O when using named pipes on Windows (5.2.0 regression; bug #17227)
- Serial: fixed broken communication with certain devices on Linux hosts
- USB/OHCI: improved behavior so that the controller state after a VM reset is closer to the initial state after VM start
- EFI: fixed HFS+ driver which in rare cases failed to access most files on a volume
- Shared clipboard: fixed hang with OS X host and Linux guest (bug #15782)
- Linux hosts: fixed kernel module compilation and start failures with Linux kernel 4.14 (bug #17267)
- X11 hosts: better handle WM_CLASS setting (bug #12534)
- Linux guests: fixed kernel module compilation and other problems with Linux kernel 4.14 (bug #12534)
- Linux guests: fixed kernel module compilation and other problems with Linux kernel 4.14
- Linux guests: fixed various 5.2.0 regressions (bug #17163)
- Bridged networking: fixed duplicate EtherType in VLAN/priority tags on Linux (5.2.0 regression; bug #17277)