No valid install candidate of QtWebKit for ubuntu

{noformat} uname -a Linux tsu 4.10.0-22-generic #24-Ubuntu SMP Mon May 22 17:43:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux sudo lshw tsu  description: Desktop Computer  product: To Be Filled By O.E.M. (To Be Filled By O.E.M.)  vendor: To Be Filled By O.E.M.  version: To Be Filled By O.E.M.  serial: To Be Filled By O.E.M.  width: 64 bits  capabilities: smbios-2.7 dmi-2.7 smp vsyscall32  configuration: boot=normal chassis=desktop family=To Be Filled By O.E.M. sku=To Be Filled By O.E.M. uuid=00020003-0004-0005-0006-000700080009  *-core  description: Motherboard  product: X79 Extreme6/GB  vendor: ASRock  physical id: 0  *-firmware  description: BIOS  vendor: American Megatrends Inc.  physical id: 0  version: P2.70  date: 02/16/2014  size: 64KiB  capacity: 8128KiB  capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification uefi  *-cpu  description: CPU  product: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz  vendor: Intel Corp.  physical id: 4  bus info: cpu@0  version: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz  slot: CPUSocket  size: 1398MHz  capacity: 4GHz  width: 64 bits  clock: 100MHz  capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm tpr_shadow vnmi flexpriority ept vpid xsaveopt dtherm ida arat pln pts cpufreq  configuration: cores=6 enabledcores=6 threads=12  *-cache:0  description: L1 cache  physical id: 5  slot: CPU Internal L1  size: 384KiB  capacity: 384KiB  capabilities: internal write-back  configuration: level=1  *-cache:1  description: L2 cache  physical id: 6  slot: CPU Internal L2  size: 1536KiB  capacity: 1536KiB  capabilities: internal write-back unified  configuration: level=2  *-cache:2  description: L3 cache  physical id: 7  slot: CPU Internal L3  size: 12MiB  capacity: 12MiB  capabilities: internal write-back unified  configuration: level=3  *-memory  description: System Memory  physical id: 1  slot: System board or motherboard  size: 16GiB  *-bank:0  description: DIMM DDR3 1600 MHz (0,6 ns)  product: F3-19200CL9-4  vendor: Undefined  physical id: 0  serial: 00000000  slot: Node0_Dimm0  size: 4GiB  width: 64 bits  clock: 1600MHz (0.6ns)  *-bank:1  description: DIMM Synchronous [empty]  product: Dimm1_PartNum  vendor: Dimm1_Manufacturer  physical id: 1  serial: Dimm1_SerNum  slot: Node0_Dimm1  width: 64 bits  *-bank:2  description: DIMM DDR3 1600 MHz (0,6 ns)  product: F3-19200CL9-4  vendor: Undefined  physical id: 2  serial: 00000000  slot: Node0_Dimm2  size: 4GiB  width: 64 bits  clock: 1600MHz (0.6ns)  *-bank:3  description: DIMM Synchronous [empty]  product: Dimm3_PartNum  vendor: Dimm3_Manufacturer  physical id: 3  serial: Dimm3_SerNum  slot: Node0_Dimm3  width: 64 bits  *-bank:4  description: DIMM DDR3 1600 MHz (0,6 ns)  product: F3-19200CL9-4  vendor: Undefined  physical id: 4  serial: 00000000  slot: Node0_Dimm4  size: 4GiB  width: 64 bits  clock: 1600MHz (0.6ns)  *-bank:5  description: DIMM Synchronous [empty]  product: Dimm5_PartNum  vendor: Dimm5_Manufacturer  physical id: 5  serial: Dimm5_SerNum  slot: Node0_Dimm5  width: 64 bits  *-bank:6  description: DIMM DDR3 1600 MHz (0,6 ns)  product: F3-19200CL9-4  vendor: Undefined  physical id: 6  serial: 00000000  slot: Node0_Dimm6  size: 4GiB  width: 64 bits  clock: 1600MHz (0.6ns)  *-bank:7  description: DIMM Synchronous [empty]  product: Dimm7_PartNum  vendor: Dimm7_Manufacturer  physical id: 7  serial: Dimm7_SerNum  slot: Node0_Dimm7  width: 64 bits {noformat}