Since 42.2 I got lot of errors of this king :

dev-disk-by\x2dpartlabel-primary.device: Dev
dev-disk-by\x2dpartlabel-primary.device appeared twice with different sysfs
paths 
/sys/devices/pci0000:00/0000:00:1f.2/ata3/host4/target4:0:0/4:0:0:0/block/sdc/sdc1
and
/sys/devices/pci0000:00/0000:00:1f.2/ata3/host4/target4:0:0/4:0:0:0/block/sdc/sdc2

Here is the output of lsblk

NAME    KNAME FSTYPE PARTTYPE                               SIZE MOUNTPOINT    
       LABEL          PARTLABEL MODEL            SERIAL UUID                   
             PARTUUID
sda     sda                                               111,8G               
                                Samsung SSD 850                                 
������sda1  sda1  ext4   0x83                                    40G /             
       SLASH_LINUX                                     
e79be9e8-10c4-4edd-93f0-7639e56198c7 09c66a03-01
sdb     sdb                                               931,5G               
                                WDC WD1001FALS-0                                
������sdb1  sdb1  xfs    ebd0a0a2-b9e5-4433-87c0-68b6b72699c7   120G /home         
       HOME_USR_LNX   primary                          
f4828664-3888-42be-8692-b6de56069f7d e9f2a204-ee96-4886-a59f-4ab09967f917
.....
.....
sdc     sdc                                               931,5G               
                                WDC WD10EZEX-75Z                                
������sdc1  sdc1  xfs    ebd0a0a2-b9e5-4433-87c0-68b6b72699c7    40G /data_my_tmp1 
       MY_TMP1_LNX    primary                          
2f23ab9a-0d1e-405b-a65d-abe36ddcf39e 72de16b6-762c-4a9e-b620-4dd1b0cdd59a
....

The problem is due to the PARTLABEL data.
On one computer (notepad asus g75vw)
sda (ssd disk) have one vfat efi partition and 3 ext4 partitions. All PARTLABEL
are set to primary and give dev-disk-by error.
sdb have 15 xfs partitions. All PARTLABEL are set to Linux filesystem and give
dev-disk-by error.
On another computer (desktop no name)
sda (ssd disk) have one ext4 partition. The PARTLABEL is empty. No error.
sdb,sdc,sdd,sde have all xfs partitions. All PARTLABEL are set to primary and
give dev-disk-by error.

Have found on google that editing PARTLABEL and giving unique name solve the
probleme.
So I am trying this and give news as soon as possible.