It can be salvaged, Tammy
Buy seam repair adhesive...it comes in a tube. Use a seam roller--and put a LOT of pressure on it--to get the seams to lie down again. If the edges still won't stay down, you may have to pull the wallcovering back a bit and apply some primer first.I put new "standard width" vinyl wallcovering over old on my boat...and btw, also got everything I needed from Sherwin Williams, including these instructions: Step 1: the old wallcovering must be washed down with mineral spirits to remove the plasticizers, and allowed to dry for at least 24 hours. (Be sure the cabin is well ventilated while you do this!)Step 2: "paint" every inch of the old with the correct primer...otherwise, the wallcovering paste won't stick to it. Apply the primer as carefully as you would if you were actually painting the wall, being especially careful to cover the areas next to doorframes, cabinetry etc completely...if you missed those areas, the edges of the wallcovering will lift. The primer must also dry for at least 24 hours.Step 3: hang the new wall covering using the right paste for the type of material (they're not all the same).Tips: The type of wallcovering that's like old fashioned "oil cloth" works much better than vinyl coated paper. Even continuous match wallcovering has a pattern that should be matched up. It's not easy to see, but if you match it, seams will be completely invisible.I found it easier to paste the wall than to try to set up scaffolding to paste the wallcovering in the confines of my cabin. And I used a regular 4" paint brush instead of a wallpaper paste brush. If you get some on the next strip, it washes off easily with a wet sponge. Use a large sponge or wallpaper brush to put it down against the wall...then after each strip is up, use a straight edge (I used a wooden yardstick cut in half) to get get ALL the bubbles out...don't quit till you're 100% certain they are all out. Use a seam roller--and put real pressure on it--till the edges of each piece no longer show at all.When cutting around door frames and cabinets, the razor knife blade should be VERY sharp...change it often. It's a time-consuming job...but if you follow every step meticulously, new over old will be indistinguishable from a factory installation--with NO seams showing--and will never lift.