Seems to be a problem with Archive Mounter (nautilus) then:
fbeister@frederic-beister-1:~ % md5sum
/home/fbeister/Downloads/done/done/ubuntu-16.04-server-i386.iso
494c03028524dff2de5c41a800674692
/home/fbeister/Downloads/done/done/ubuntu-16.04-server-i386.iso
fbeister@frederic-beister-1:~ % ls -l
/run/user/1000/gvfs/archive:host=file%253A%252F%252F%252Fhome%252Ffbeister%252FDownloads%252Fdone%252Fdone%252Fubuntu-16.04-server-i386.iso/install
insgesamt 85897
-r-------- 1 fbeister fbeister 4925 Apr 21 00:10 filesystem.manifest
-r-------- 1 fbeister fbeister 10 Apr 21 00:10 filesystem.size
-r-------- 1 fbeister fbeister 73777152 Apr 21 00:10 filesystem.squashfs
-r-------- 1 fbeister fbeister 933 Apr 21 00:32 filesystem.squashfs.gpg
-r-------- 1 fbeister fbeister 12512967 Apr 21 01:10 initrd.gz
-r-------- 1 fbeister fbeister 182704 Jan 28 13:44 mt86plus
dr-x------ 1 fbeister fbeister 2048 Apr 20 16:02 netboot
-r-------- 1 fbeister fbeister 1865 Okt 22 2015 README.sbm
-r-------- 1 fbeister fbeister 1474560 Okt 22 2015 sbm.bin
-r-------- 1 fbeister fbeister 0 Apr 20 16:02 vmlinuz
** Also affects: nautilus (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1583354
Title:
ubuntu-16.04-server-i386.iso misses /install/vmlinuz
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